情态动词need的用法

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need的五种用法

need的五种用法

千里之行,始于足下。

need的五种用法1. Need作为动词,表示需要、必需。

例如:- I need a new phone.(我需要一部新手机。

)- We need to finish this project by tomorrow.(我们必需在明天之前完成这个项目。

)2. Need作为名词,表示需求、需要。

例如:- There is a great need for affordable housing in this city.(这个城市格外需要经济适用房。

)- The organization aims to meet the needs of children in poverty.(该组织旨在满足贫困儿童的需求。

)3. Need作为形容词,表示必要的、需要的。

例如:- This is a need-to-know basis.(这是需要知道的基础。

)- You have all the tools you need.(你拥有全部你需要的工具。

)4. Need作为情态动词,后接动词原形,表示应当、必需。

这种用法往往带有建议、劝告的意味。

例如:- You need to be more careful when driving in the rain.(下雨时你需要更加当心驾驶。

)- She needs to work on her communication skills.(她需要提高自己的沟通技巧。

)5. Need还可以表示被动语态的意义,表示被需要、被要求。

例如:- The car needs to be repaired.(这辆车需要修理。

)- The report needs to be submitted by the end of the week.(这份报告需要在本周末前提交。

)第1页/共2页锲而不舍,金石可镂。

以上是need的五种常见用法。

它既可以作为动词,表示需要、必需,也可以作为名词、形容词、情态动词等不同词性使用,用于不同的语境中。

情态动词need用法,掌握3点就OK!.doc

情态动词need用法,掌握3点就OK!.doc

情态动词need用法,掌握3点就OK!
一、在肯定句中,need表示“需要”,后接动词原形,表示某人需要做某事。

1.You need do it again.你需要重复做一遍。

2. We need finish this homework first.我们需要先做这些作业.
3.They need fill in the form.他们需要填表.
4.We need think it over before we step. 在行动之前我们需要深思.
二、在否定句中,用need的否定形式+动词原形。

表示某人不必做么事.
1.We neednt worry about that.我们不必担心。

2.You neednt mention it just now.你刚才不必提起这件事。

3.They neednt say that when he asks about it.当他问的时候,你不必要说。

上述neednt+动词原形,相当于not have to.
三、在一般疑问句中,把need提到主语前。

1.Need we take the money with us?我们需要带钱吗?
2.Need the problem be solved first?这个问题需要先解决吗?
3.Need I do the housework today?今天需要我做家务吗?其一般疑问句的答语,肯定用must,否定用neednt。

Need I go with you? 我需要和你一起去吗?Yes,you must.
是的,你需要去。

No,you neednt. 不,你不必去。

情态动词need的用法汇总

情态动词need的用法汇总

情态动词n e e d的用法汇总Document serial number【KK89K-LLS98YT-SS8CB-SSUT-SST108】need”的用法及其区别“need”既可以作,也可以作,但是它们的用法不同。

作为的“need”的用法与其他情态动词“can”,“may”,“must”的用法基本相同:在词组中总是位居第一,没有非限定形式,即没有、-ing分词或-ed 分词等形式;现在时没有词形变化;情态动词之间是相互排斥的,即在一个词组中只能有一个情态动词。

下面是“need”作为情态动词的用法:一、need表示“需要”或“必须”,通常用于和疑问句。

例如:1.You needn't do it again.你不需要再做了。

2.He needn't worry about it.这件事他无需担心。

3.Need he do this homework first他需要先做这些作业吗4.Need they fill in the form他们需要填表吗二、在中,可以用need的否定形式+完成体。

例如:1.We needn't have worried.其实我们不必要慌。

2.You needn't have mentioned it.你本来不必提起这件事。

3.You needn't have said that when he asked.当他问的时候,你其实不必要说。

三、needn't后的间或也能用或。

例如:1.He needn't be standing in the rain.他不必要站。

2.We needn't be waiting in this place.我们不必要在这儿等。

3.The hedges needn't be trimmed thisweek.本周树蓠不必要整修。

“need”作为时,通常用法是:人+need +to do物+need +doing物+need +to be done另外,“need”后还可以直接跟名词。

need的情态动词的用法

need的情态动词的用法

need的情态动词的用法一、need的情态动词用法简介Need是一个常见的英语词汇,可以作为实义动词或情态动词使用。

作为情态动词时,need表示必要性、需要、应该等含义,它的用法有一些特殊之处。

本文将详细介绍need作为情态动词时的用法,并提供一些例句加深理解。

二、need作为主要动词的用法1. Need作为主要动词时,可以直接跟名词或代词作宾语。

例如:- I need a break.(我需要休息。

)- They need your help.(他们需要你的帮助。

)2. Need后面还可接to不定式构成need to的结构,表示“需要做某事”。

例如:- You need to finish this report by tomorrow.(你需要在明天之前完成这份报告。

)3. 在疑问句和否定句中,我们可以将助动词do/does/did加在need后面,而不是直接将need变为负形式或疑问形式。

例如:- Do you need any help?(你需要帮助吗?)- He doesn't need that anymore.(他不再需要那个了。

)三、need作为情态动词的用法1. 对于肯定句,need作为情态动词时,在句中一般省略do/does/did。

例如:- You needn't worry about it.(你不需要担心。

)- She needn't go to work today.(她今天不必去工作。

)2. 在否定句中,need作为情态动词时,后面的动词原形表示否定意义,而不需要加上not。

例如:- You needn't apologize.(你不必道歉。

)- We needn't pay for the tickets.(我们不需要支付门票费用。

)3. 对于疑问句,need作为情态动词时,在句子前面加上needn't形式的疑问词即可。

need情态动词的用法

need情态动词的用法

need情态动词的用法Need 情态动词的用法Need 是一种情态动词,它意味着“必要”或“需要”。

在英语中,need 被用作情态动词,而不是普通动词,因此它不带有主语和谓语形式。

Need 情态动词可以用来表达一种强烈的要求或需求,表明某事是必要的、重要的或有益的。

在这种情况下,need 常常与表示需求的名词或动词短语连用,如 need help(需要帮助)、need advice(需要建议)等。

例句:1. I need to go to the store.我需要去商店。

2. We need more time to finish this project.我们需要更多时间来完成这个项目。

3. She needs to study harder if she wants to pass the test.如果她想通过考试,她需要更加努力地学习。

4. You need to take a break.你需要休息一会儿。

Need 情态动词也可以用来表达一种强烈的愿望或请求。

这时,need 常常伴随着一些否定词,以增加愿望的强烈性。

例如,need not 和 needn't 表示“不必”,即“不必做某事”;need never 表示“永不”,即“永远不必做某事”。

例句:1. You need not worry about it.你不必担心这件事。

2. You needn't hurry.你不必急着走。

3. You need never do that again.你永远不必再做那件事了。

Need 情态动词还可以表达一种比较弱的要求或需求,表明某事虽然不是必须的,但也很有益。

在这种情况下,need 常常用在疑问句中,表明对答案的疑惑或缺乏确定性。

例句:1. Do I need to come to the meeting?我需要参加会议吗?2. Do you need any help?你需要帮助吗?3. Does he need to buy a new car?他需要买一辆新车吗?Need 情态动词还可以用来表示一种推测或判断,表明某人可能需要某物或做某事。

情态动词need用法

情态动词need用法

情态动词need用法1. “Need”可以用来表示需要做某事,就像你饿了需要吃饭一样。

比如说“I need to do the laundry.”(我需要去洗衣服。

)2. 当你特别强调必须要做某事的时候,“need”就派上用场啦,就像你明天考试,今晚你就 really need to study hard.(你真的非常需要努力学习。

)例如“You really need to be careful.”(你真的需要小心。

)3. 有时候我们会对别人说你需要怎么做,这时候也能用“need”呀,就像对朋友说“Hey, you need to cheer up!”(嘿,你需要振作起来呀!)比如“He needs to apologize.”(他需要道歉。

)4. “Need”还能用来表示某物需要被怎么样,就像汽车需要加油一样。

像“The car needs to be refueled.”(这辆车需要被加油。

)5. 当你觉得某件事应该做,不做不行,这不就是“need”嘛,好比说“ We need to get there on time.”(我们需要按时到那里。

)比如“They need to finish the project as soon as possible.”(他们需要尽快完成这个项目。

)6. 我们也常说不需要做某事呀,“needn’t”就出场咯!例如“I needn’t buy a new coat now.”(我现在不需要买新外套。

)7. 想想看,要是没有“need”,我们该怎么表达这些需要呀,所以它真的很重要呢!就像生活中不能没有水一样。

比如“Don’t you think you need to take a break?”(难道你不觉得你需要休息一下吗?)结论:“need”的用法真的很多很实用,我们在日常交流中经常会用到它,一定要好好掌握呀!。

need做情态动词的用法

need做情态动词的用法"Need"是一种情态动词,即在句子中用于提供建议、必要性或可能性等语气的词汇。

它通常用于表示一种强烈的需求或要求,可以用于许多不同的语境中,例如询问或建议行动,表达要求或需要等。

"Need"可以作为助动词,即与其他动词连用来形成其余时间或语态的结构,也可以作为主要动词,在疑问句中充当动词。

在这两种情况下,"need"具有一系列不同的语法形态和用法。

作为助动词,"need"通常用于表示必要性或建议行动,例如:- You need to take more exercise.(你需要多锻炼。

)- The car needs to be serviced.(汽车需要保养。

)- He doesn't need to worry.(他不必担心。

)使用"need"作为主要动词通常需要使用助动词“do”或“does”来帮助构成疑问句和否定句,例如:- Do you need any help?(你需要帮助吗?)- Does she need to buy anything?(她需要购买什么吗?)- I don't need your advice.(我不需要你的建议。

)此外,"need"还可以用于构成被动语态,例如:- The car needs to be repaired.(汽车需要维修。

)- The house needs to be cleaned.(房屋需要打扫。

)- The book needs to be returned.(这本书需要归还。

)除了这些语法形态外,"need"还可以用于表达其他含义。

例如,它可以用于表示可能的情况,例如:- You need to be careful driving in the snow.(在雪地驾驶时需要小心。

情态动词need的用法汇总

need”的用法及其区别“need”既可以作;也可以作;但是它们的用法不同..作为的“need”的用法与其他情态动词“can”;“may”;“must”的用法基本相同:在词组中总是位居第一;没有非限定形式;即没有、-ing分词或-ed分词等形式;现在时没有词形变化;情态动词之间是相互排斥的;即在一个词组中只能有一个情态动词..下面是“need”作为情态动词的用法:一、need表示“需要”或“必须”;通常用于和疑问句..例如:1.You needn't do it again.你不需要再做了..2.He needn't worry about it.这件事他无需担心..3.Need he do this homework first 他需要先做这些作业吗4.Need they fill in the form 他们需要填表吗二、在中;可以用need的否定形式+完成体..例如:1.We needn't have worried.其实我们不必要慌..2.You needn't have mentioned it.你本来不必提起这件事..3.You needn't have said that when he asked.当他问的时候;你其实不必要说..三、needn't后的间或也能用或..例如:1.He needn't be standing in the rain.他不必要站..2.We needn't be waiting in this place.我们不必要在这儿等..3.The hedges needn't be trimmed thisweek.本周树蓠不必要整修..“need”作为时;通常用法是:人+need +to do物+need +doing物+need +to be done另外;“need”后还可以直接跟名词..请看下面的例子:1.We need to collect the parcel before we leave for England.去英国之前;我们需要收拾好行李..2.We need to tell him the truth.我们需要告诉他真相..3.My car needs repairing.我的汽车需要修理..4.The flowers need watering.这些花需要浇水..5.His leather shoes needs to be mended.他的皮鞋需要修补..6.Her room needs cleaning.她的房间需要打扫..7.It is aquestion that needs very careful consideraton.这是一个需要慎重考虑的问题..8.I need a watch.我需要一块手表..一、need 作情态动词:二、1不能单独作谓语; 只能和其他动词原形构成谓语;三、2在句中放在谓语动词之前; 谓语动词前若有助动词;则在助动词之前;疑问句中; 则在主语之前..四、3多用在否定句或疑问句中;五、4无人称和数的变化;六、5否定式构成是在后面加 "not"..七、Need I attend the meeting tomorrow八、我需要明天参加会议吗九、You need not hand in the paper this week.十、这一周你不必交论文..十一、You didn't need to tell him the news; it just made him sad. 十二、你无需告诉他这一消息; 那只会使他悲哀..十三、二、need作实义动词时: need 就像其他动词一样;有第三人称;单复数; 后面加带 to 的动词等特性..十四、I need a bike to go to school.十五、我上学需要一辆自行车..十六、Do you need a dictionary 你需要词典吗十七、She needs a necklace.她需要一条项链..十八、needn't + have + 过去分词表示“过去做了没必要做的事情.. ”十九、You needn't have taken it seriously.二十、这件事情你不必太认真..情态动词need的用法作为情态动词;need一般只用于否定句和疑问句中..You needn’t try to explain. 你不需要解释..She needn’t come tomorrow. 她明天不必来..Need we stay here this evening 今晚我们需要在这儿住下来吗Need 作为实意动词比作为情态动词常用的多..实意动词need 可用在所有句型中..She needs to come tomorrow. 明天她需要来..You don’t need any help from others. 你不需要别人的任何帮助.. He doesn’t need to borrow money. 他不需要借钱..Do they need this 他们需要这个吗Plants need sun light in order to grow. 植物需要阳光才能生长.. You don’t need to work so hard. 你不需要这么样地努力工作..Your shoes need cleaning/to be cleaned. 你的鞋子需要清洁..The job doesn’t need much attentio n or time. 这份工作很省心省事.. What he needs is a good beating. He needs a good beating. 需要好好揍他一顿need的用法■作情态动词:通常用在疑问句、否定句中;或与条件句、whether; hardly; nobody等连用..如:Need he go so soon他这么快就要走吗He needn’t go. 他不必走..If she wants anything; she need only ask. 她想要什麽; 只需说一声就行..He wondered whether they need go there. 他不知道他们是否需要去那里..Nobody need be afraid of catching the disease. 谁都不用害怕能得这种病.注意:1. 因 need 不能用于肯定句;因此肯定回答要用 must..如:—Need I stay here any longer 我需要在这呆下去吗—No; you needn’t. 不需要..—Yes; you must. 是的;需要呆下去..2. need have done 的否定式或疑问式;表示“本来不必做某事;但事实上却做了”..如:She needn’t have come in person a call would have been enough. 她本不必亲自来——打个电话来就足可以了..Need you have paid so much你当时真须要付那麽多钱吗■作行为动词:可用于疑问句、否定句和肯定句..如:Does he need to go so soon他这么快就要走吗He doesn’t need to go.他不需要走..They need our help. 他们需要我们帮助..注:作行为动词的need后可接动名词的主动式表示被动含义..如:The garden needs watering=to be watered . 花园该浇水了..■还可作名词:表示“需要; 必需; 必需品”等..如:The doctor told me I was in need of a good rest. 医生说我需要好好休息..There is no need for you to go. 你没有必要去..Our needs are modest. 我们的必需品是谦虚1. 基本用法特点need可用实意动词和情态动词;用作情态动词时;意思是“有必要”或“需要”;其后接动词原形;通常只用于否定句或疑问句以及if或whether 之后;一般不用于肯定句..如:You needn‘t worry. 你不必担心..Why need you go today 为什么你需要今天走He wondered whether they need send a deposit. 他不知道他们是否得交定金..「注」1 由于用作情态动词的need通常不用于肯定句;所以对于以need开头的疑问句的否定回答可用needn‘t;但是肯定回答却不能用Yes; you need之类的;应根据具体情况改用其他表达..如:"Need he stay here " "Yes; he must." “他有必要留在这儿吗”“是的;必须留在这儿..”2 need有时用于含有only; all 等表限制意义的肯定句中..如:This is the only form you need fill in. 你要填的只有这一张表..All you need do is to take a taxi from the airport. 你只需从机场打个的即可..2. 后接动词完成式的用法若要谈论过去情况;应在其后接动词完成式..如:You needn‘t have come in person. 你当时不必亲自来的..Need you have paid so much 你当时真需付那么多钱吗「注」1 在宾语从句中可直接用need表示过去也可用didn‘t have to..如:He said he need not didn‘t have to hurry. 他说他不必匆忙..2 注意对“need+have+过去分词”结构疑问式的回答..如:"Need he have come so early " "Yes; he had to." / "No; he needn‘t have."“他来那么早有必要吗”“有必要;他必须来那么早..”/“不;他本来没有必要来那么早的..”3. 后接动词进行式的用法有时后接进行式表示动作正在进行..如:We needn‘t be standing here in the rain. 我们没有必要站在这里被雨淋..4. needn‘t have done与didn’t need to do前者主要表示某事已经做了;但后来觉得没必要去做;因此常含有责备或遗憾之意;后者则不具体表明某事是否做了即可能做了也可能没有做;此用法中的need为实意动词..如:I got up early; but I needn‘t have done so; because I had no work to do that morning. 我起床起得很早;但我本来不必起那么早的;因为我那天早上没什么事做..I didn‘t need to get up early this morning; so I stayed in bed until9 am. 今天早上我不必早起;所以我一直睡到上午九点钟才起床..若没有特定的上下文;有时可能有歧义..如:I didn‘t need to go the office yesterday.1 我昨天无需去那儿..所以没去=I didn‘t have to go there yesterday.2 我昨天本来不必去那儿的..但我却去了=I needn‘t have gone there yesterday.need和dare的用法要点need和dare可用作实义动词和情态动词;用作实义动词时;后接动词要用不定式;有人称和数的变化;可用肯定句、否定句和疑问句;用作情态动词时;主要用于否定句和疑问句中;没有人称和数的变化;后接动词要用动词原形..如:You need not pay—it is free. 你不必付钱;这是免费的..We need to have lots of patience. 我们需要有很大的耐心..Who would dare to tell him 谁会敢告诉他He dared not go there at night. 晚上他不敢到那里去..How dare you ask me such a question 你怎么敢问我这样的问题注:need 表示“需要”;其后可接动名词;且要用主动形式表示被动意义..如:The room needs cleaning. 这房间需要打扫了..need表示“需要”或“必须”;通常用于否定句;疑问句;条件句..例如:1.You needn't do it again.你不需要重复做了..2.He needn't worry about it.这件事他无需担心..3.Need he do this homework first 他需要先做这些作业吗4.Need they fill in the form 他们需要填表吗二、在否定句中;可以用need的否定形式+不定式完成体..例如:1.We needn't have worried.其实我们不必担心..2.You needn't have mentioned it.你本来不必提起这件事..3.You needn't have said that when he asked.当他问的时候;你其实不必要说..三、needn't后的不定式间或也能用进行式或被动语态..例如:1.He needn't be standing in the rain.他不必要站在雨中..2.We needn't be waiting in this place.我们不必要在这儿等..3.The hedges needn't be trimmed this week.本周树蓠不必要整修..四、其一般疑问句的答语;肯定用must;否定用needn't..Need I go with her 我需要和她一起去吗Yes;you must. 是的;你需要去..No;you needn't. 不;你不必去..作实义动词主+need +to do主+need +doing =sth+need +to be done都是实义动词;注意其否定为主+don‘t/doesn't+need +to be done 或主+needn’t +be done例如:The room needs cleaning = The room needs to be cleaned. 房间需要打扫了..另外;“need”作实义动词时后还可以直接跟名词..请看下面的例子:It is a question that needs very careful consideration.这是一个需要慎重考虑的问题很简单的方法区别情态动词与实义动词:当need为情态动词时;意思是“必要”;否定为"needn't";后面大多接动词原形;表示动作;当need为实义动词时;意思是“需要”;否定为"don't need";后面大多跟名词..词汇搭配~+名词need clothes 需要衣服need education 需要受教育need food 需要食物need help 需要帮助need money 需要钱need rice 需要大米need water 需要水~+副词need critically 极为重要地需要need desperately 不顾一切地需要need directly 直接地需要need economically 经济上地需要need genuinely 真正地需要need horribly 惊人地需要need imperatively 紧急地需要need sorely 非常需要need spiritually 精神上需要need urgently 强烈地需要~+介词need for 为…而需要need in 在…需要词语辨析need;want这组词都有“需要;要求”的意思..其区别是:need表示因缺少而需要某物或需要做某事;尤其强调这种需要的迫切性; want表示从一般需要的意向到强烈、迫切的要求以及各种程度不同的愿望..need作情态动词的用法:need用作情态动词时表“必须必要”的意思;后直接跟动词原型;且need 无人称、数的变化第三人称单数不加s;也没有非谓语形式不定式、分词..注意:need用作情态动词时常用于否定句和疑问句中..例:Need he bring his laptop tomorrow 明天他必须带他的笔记本过来吗Come on; you needn't worry about it becuse it's not your fault. 行啦;你不必担心的因为那不是你的错..She needn't have arrived so early; need she 她本不必到得这么早;不是吗注意:must引导的一般疑问句的否定回答必须使用needn't..例如:-Must I leave 我必须离开吗-No; you needn't. 不;你不必离开..二、need作实意动词的用法:1、need + something 需要某物例:I need some fruits to eat. 我需要些水果来吃..2、need to do something 需要做某事例:You don't need to have the bike repaired right away. 你不必马上去修车..3、need doing = need to be done 需要……例:The room needs cleaning = The room needs to be cleaned. 房间需要打扫了..4、need somebody to do something 需要某人做某事例:I need someone to help me out of this problem. 我需要找人来帮助我解决这个问题..三、need作名词的用法:need用作名词时;既可以是可数名词;也可以是不可数名词..主要常用句型如下:1、There's no need to do something 没必要做某事例:There's no need to cover such a long distance. 没必要走那么远的距离..There's no need for me to break the window because I have the key. 我没必要打破窗户因为我有钥匙..No need to run since we're not pressed for time. 不必跑啦;我们又不赶时间..也可以单独使用:There's no need. 意思是“没有必要”..2、in great need of 非常需要例:The rescue team is in great need of medicine. 救援小组非常需要药品..3、if need be 如果需要的话例:If need be; I'm going to do you a favor. 如果需要的话我会帮你的..四、关于need的一些短语、俚语用法..1、A friend in need is a friend indeed. 患难之交才是真朋友.. could+have+过去分词”的10种用法一、表示主观猜测即对已经发生动作或已经存在的状态作出主观上的猜测;通常可译为“可能已经”;有时需根据具体语境来..如:We could not have heard them because of the noise from the river.由于有河水声我们不能听见他们的话..Tom could have taken the money; he was here alone yesterday. 有可能是汤姆把钱拿走了;昨天他单独一个人在这里呆过..We knew he couldn’t have paid for it; because he had no money. 我们知道不可能是他付了这笔钱;因为他没钱..说明该用法也可将could换成can;但这只限于否定句和疑问句;因为can 表推测时不用于肯定句而could可以用于肯定句..如:Can he have left already 他会已经离开了吗They can’t have gone out because the light’s on. 他们不可能出去了;因为灯还亮着..二、表示未曾实现的能力即表示过去本来有能力可以做某事的;但实际上没有那样去做;通常译为“本来可以”“本来能够”等..如:The worst of it is that I could have prevented the accident. 最糟糕的是我本来可以防止这次事故的..We could have got in for nothing—nobody was collecting tickets. 我们本可以不买票就进去——根本没人收票..I could have passed my examination easily but I made too many stupid mistakes. 我本可以轻易通过考试;但我犯了太多不该犯的错误..有时用于反语..如:You’ve broken my pen—thanks for nothing; I could have done that for myself. 你把我的笔给弄坏了——你得了吧;就那我自己也会弄..三、表示未曾实现的可能性即表示过去本来可能发生的情况;而实际上没有发生;通常译为“本来可以”“本来可能”等..如:She could have been seriously injured. 她本来可能伤得很重的..It’s difficult enough; but it could have been worse. 这事情够困难的了;本来可能会更糟呢..有时也可根据语境译为“好在没有”“差点”;尤其是当谈论的是“不好”的情况时..如:She felt miserable. She could have cried. 她感到很痛苦;她差点哭了..That was a bad place to go skiing—you could have broken your leg. 那不是一个滑雪的好地方;好在你没有把腿给摔断..Why did you throw the bottle out of the window Somebody could have been hurt. 你为什么把瓶子扔出窗外呢好在没有砸伤人..They were lucky—they could have been killed. 他们很幸运;差点被打死了..Did you see him fall He could have killed himself. 你看见他摔倒了吗他差点摔死了..有时需要有比较灵活的:When I discovered I’d come for the appointment on the wrong day;I could have kicked myself. 我来赴约发现把日期弄错了;感到非常懊恼..四、表示未曾实现的想法即表示过去本来有做某事的打算或意图;但实际上没有实现;通常译为“本来可以”..如:I could have lent you the money. Why didn't you ask me 我本来可以借这笔钱给你的..你为什么不向我提出I could have given you some hints; but I suppose you thought yourself too grand. 我本可以给你点提示的;但是我认为你太自负了..五、表示未曾实现的选择即表示过去本来可以有机会选择做某事;但实际上没有那样做;通常译为“本来可以”..如:Her husband could have told her; but he did not choose to. 她丈夫本来可以告诉她的;但他不想这样做..I could have lent you the money. Why didn’t you ask me 我本来可以借这笔钱给你的;你为什么不向我提出y ou needn’t have typed it twice. You could have used a carbon. 你没必要打两遍的;你当时本可以用复写纸打..You needn’t have walked up; you could have taken the lift. 你没必要走着上去;你本来可以乘电梯的..六、表示批评或责备即表示过去本来有责任或义务应该做某事;但实际上却没有做成;含有批评和责备的意味;通常译为“本来应该”“本来可以”等..如:You could have started a little earlier. 你本可早点动身的..You could have helped me—why did you just sit and watch 你本来可以帮我一把嘛——为什么你只是坐在那儿观望呢I am disappointed that you didn’t tell me. You could have told me. 你没告诉我;我感到很失望;你本来应该告诉我的..You could have let me know you were going out tonight. 你本来可以告诉我你今晚是要出去的七、表示达到极限表示即使人们尽力而为去做某事;但还是未能做成;通常用于否定句..如:I couldn’t have won; so I didn’t go in for the race. 反正我也赢不了;所以我就没有参加赛跑..I couldn’t have enjoyed myself more—it was a perfect day. 我玩得没法再痛快了——这一天简直痛快极了..八、表示惊讶表示对所发生的情况感到惊奇;含有“竟然”的意味..如:It seems inconceivable that the accident could have happened soquickly. 这一事故发生得这么快;简直不可思议..Well; I’m blowed I should never have thought you could have done it. 真想不到我从未想到居然办得到..九、用于虚拟语气在虚拟条件句中;当谈论过去的情况时;其句型通常是:主句用“could / would / should /might+have+过去分词”;从句用过去完成时..如:If I hadn’t warned you; you could have been killed. 我如不是警告了你;你就可能丧命了..If you had come sooner; you could have helped us. 你如早来一点;就会帮上我们了..If he had known the facts; he could have told us what to do. 如果他了解事实;他是可能告诉我们怎样做的..If anybody had asked me; I could have told them what happened. 如果有谁问过我;我可以告诉他们发生了什么情况..十、用于某些口语惯用表达可用于某些口语惯用表达;如用于I could have sworn…;其意是“我可以发誓”“我千真万确”..如:I could have sworn I’d paid that bill. 我可以发誓我付过账..I could have sworn I heard a knock at the door. 我千真万确听到了敲门声..l情态动词+have+done是重点和难点之一;现将其用法总结归纳如下:一、“must+have+done”表示对过去事情的肯定推测;译成“一定做过某事”;该结构只用于肯定句..1. It must have rained last night; for the ground is wet. 昨晚一定下雨了;因为地面还是湿的..2. You must have been mad to speak to the servant. 你和仆人说话;一定是发疯了..二、“can't+have+done”表示对过去事情的否定推测;译成“不可能做过某事”..1. Mr. Smith can't have gone to Beijing; for I saw him in the library just now. 史密斯先生不可能去北京了;我刚才还在图书馆见过他..2. Mary can't have stolen your money. She has gone home. 玛丽不可能偷你的钱;她回家去了..三、“can+have+done”表示对过去行为的怀疑;用于疑问句;译成“可能做过……吗”..1. There is no light in the room. Can they have gone out 屋里没有灯;他们可能出去了吗2. There is nowhere to find them. Where can they have gone 到处找不到他们;他们可能到什么地方去呢四、“could+have+done”是虚拟语气;表示对过去事情的假设;意思是本来能够做某事而没有做..He could have passed the exam; but he was too careless. 本来他能够通过考试;但是他太粗心..五、“may+have+done”表示对发生过的事情的推测;意思是“可能已经”或“也许已经”;用于肯定句中..—What has happened to George—I don't know. He may have got lost.—乔治发生了什么事——我不知道;他可能迷路了..六、“might+have+done”表示对过去事情的推测;might与may意思相同;但可能性更小..多用于虚拟语气结构中..1. He might have given you more help; even though he was busy. MET90 他或许会多给你一些帮助;即使他很忙..2. She might have achieved greater progress; if you had given her more chances. 如果你多给她点机会;她可能已经取得更大的成绩..七、“would+have+done”虚拟语气;表示对过去事情的假设;意思是“本来会做”..1. I would have told you all about the boy's story; but you didn't ask me. 我本来会告诉你这个小男孩的故事;但是你没有问我..2. Without your help; I wouldn't have achieved so much. 没有你的帮助;我是不会取得如此大的成绩..八、“should+have+done”意思是“本来应该做某事;而实际没做..” “shouldn't+have+done”表示本来不应该做某事;而实际做了..含有指责对方或自责的含意..1. Tom; you are too lazy. The work should have been finished yesterday. 汤姆;你太懒惰了;这项工作本来应该昨天就做完的..2. Look; Tom is crying. I shouldn't have been so harsh on him. 看;汤姆哭了;我本来不应该对他如此严厉..3 you should have told me 你早就应该告诉我九、“ought to+have+done”表示过去应该做而实际并没有做;译成“理应做……”;往往表示遗憾..与“should+have+done”用法基本一样..I ought to have gone home last Sunday. 我理应上星期日回家..You ought not to have given him more help. 你不应该帮助他那么多..十、“need+have+done”表示本来需要做某事而没有做..“needn't+have+done”则表示“本来不需要做某事而做了”..I needn't have bought so much wine—only five people came. 我本来没有必要买这么多酒;只来了五个人..He need have hurried to the station. In that case; be wouldn't have missed the train. 他本来需要快点去车站;那样的话;他就不会误了火车..you need not have said that你没必要这么说would like to have done sth 本打算做某事I would like to have read the article; but I was very busy then.would rather +have done 当时宁愿做了或没做I would rather have refuse his offerYou should have told me so before.你早就应该告诉我..。

情态动词need的用法汇总

need”的用法及其区别“need”既可以作,也可以作,但是它们的用法不同。

作为的“need”的用法与其他情态动词“can”,“may”,“must”的用法基本相同:在词组中总是位居第一,没有非限定形式,即没有、-ing分词或-ed分词等形式;现在时没有词形变化;情态动词之间是相互排斥的,即在一个词组中只能有一个情态动词。

下面是“need”作为情态动词的用法:一、need表示“需要”或“必须”,通常用于和疑问句。

例如:1.You needn't do it again.你不需要再做了。

2.He needn't worry about it.这件事他无需担心。

3.Need he do this homework first他需要先做这些作业吗?4.Need they fill in the form他们需要填表吗?二、在中,可以用need的否定形式+完成体。

例如:1.We needn't have worried.其实我们不必要慌。

2.You needn't have mentioned it.你本来不必提起这件事。

3.You needn't have said that when he asked.当他问的时候,你其实不必要说。

三、needn't后的间或也能用或。

例如:1.He needn't be standing in the rain.他不必要站。

2.We needn't be waiting in this place.我们不必要在这儿等。

3.The hedges needn't be trimmed thisweek.本周树蓠不必要整修。

“need”作为时,通常用法是:人+need +to do物+need +doing物+need +to be done另外,“need”后还可以直接跟名词。

请看下面的例子:1.We need to collect the parcel before we leave for England.去英国之前,我们需要收拾好行李。

情态动词need的用法

情态动词need的用法一、need的基本用法Need是一个情态动词,表示需要、必需。

它通常紧跟一个名词或代词作补语,并可以和助动词do构成疑问句或否定句。

1. 肯定句结构:主语 + need + 宾语(名词/代词)例如:- I need a new laptop.(我需要一台新电脑。

)- She needs some help with her homework.(她需要一些关于作业的帮助。

)2. 否定句结构:主语 + do not/does not need + 宾语(名词/代词)例如:- They do not need any more information.(他们不需要更多的信息。

)- He doesn't need your assistance.(他不需要你的帮助。

)3. 疑问句结构:Do/Does + 主语 + need + 宾语(名词/代词)?例如:- Do you need any help?(你需要帮忙吗?)- Does she need a ride to the airport?(她需要去机场吗?)二、need和to 的搭配1. 肯定句结构:主语 + need + to-infinitive说明:当need后接动词原形时,to不能省略。

例如:- We need to finish this project by Friday.(我们需要在星期五之前完成这个项目。

)- Mary needs to buy some groceries for dinner tonight.(玛丽需要买一些晚餐的杂货。

)2. 否定句结构:主语 + do not/does not need + to-infinitive例如:- They do not need to attend the meeting tomorrow.(明天他们不需要参加会议。

)- He doesn't need to bring his passport for this trip.(他不需要带护照去旅行。

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“need”双重角色的用法及其区别
“need”既可以作情态动词,也可以作实义动词,但是它们的用法不同。

作为情态动词的“need”的用法与其他情态动词“can”,“may”,“must”的用法基本相同:在限定动词词组中总是位居第一,没有非限定形式,即没有不定式、-ing 分词或-ed分词等形式;第三人称单数现在时没有词形变化;情态动词之间是相互排斥的,即在一个限定动词词组中只能有一个情态动词。

下面是“need”作为情态动词的用法:
一、need表示“需要”或“必须”,通常用于否定句和疑问句。

例如:
1.You needn't do it again.你不需要再做了。

2.He needn't worry about it.这件事他无需担心。

3.Need he do this homework first?他需要先做这些作业吗?
4.Need they fill in the form?他们需要填表吗?
二、在否定句中,可以用need的否定形式+不定式完成体。

例如:
1.We needn't have worried.其实我们不必要慌。

2.You needn't have mentioned it.你本来不必提起这件事。

3.You needn't have said that when he asked.当他问的时候,你其实不必要说。

三、needn't后的不定式间或也能用进行式或被动语态。

例如:
1.He needn't be standing in the rain.他不必要站在雨中。

2.We needn't be waiting in this place.我们不必要在这儿等。

3.The hedges needn't be trimmed thisweek.本周树蓠不必要整修。

“need”作为实义动词时,通常用法是:
人+need +to do
物+need +doing
物+need +to be done
另外,“need”后还可以直接跟名词。

请看下面的例子:
1.We need to collect the parcel before we leave for England.去英国之前,我们需要收拾好行李。

2.We need to tell him the truth.我们需要告诉他真相。

3.My car needs repairing.我的汽车需要修理。

4.The flowers need watering.这些花需要浇水。

5.His leather shoes needs to be mended.他的皮鞋需要修补。

6.Her room needs cleaning.她的房间需要打扫。

7.It is aquestion that needs very careful consideraton.这是一个需要慎重考虑的问题。

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