详解PowerCopy用法

详解PowerCopy用法
详解PowerCopy用法

详解PowerCopy用法

一 PowerCopy命令

1 建立好欲加入使用PowerCopy的特征,草绘支撑是yz plane

2 Insert—Knowledge Templates—PowerCopy,即出现建立PowerCopy对话框

3 在特征树上单击欲加入PowerCopy的特征,包含pad,pocket,sketch,单击后特征集合会出现在Definition选项卡中,在特征树上或在Definiton选项卡中再单击特征,特征就会从Definiton选项卡中消失,如果PartBody中的所有特征都是欲加入PowerCopy的特征,则可以直接单击PartBody。可以在Definition选项卡中,更改特征集合的名称myPowerCopy01

4 在Inputs选项卡中出现此特征集合的建构基准,这里是yz plane(yz plane),

5 在Paremeters选项卡中,与此特征集合相关的数据都会出现。单击欲供用户利用PowerCopy时可更改的几何,再双击几何或者单击下面几何显示左面的Published Name,即可将此参数设为可定义,也就是使用此PowerCopy时可以自定义被Published的参数。建议用户将原来名称重新命名一个具有代表性的名称(会出现在name字段),以方便事后阅读。

6 在Document选项卡中,可以设置相关的文件以供参考,但一般不设置。

7 在Properties选项卡中,Icon choice可以指定表示PowerCopy的图标,而Preview选项中,单击Grab screen按钮可以把目前的画面拍下制成缩图,以供用户在后续作业时的参考,单击Remove preview可以移除由Grab screen按钮把目前的画面拍下制成的缩图。

8 单击OK按钮,即可建立PowerCopy。建立好PowerCopy后,需将文件存盘并且关闭,才能使用,此处将文件存为myPowerCopy01.CATPart。

9 建立PowerCopy 时,有几点需要注意:

尽量减少集合中的特征个数,提高处理速度

尽量使用无参数的参考基准,增加可用性

建立全约束的草图,减少不可预测性

一个CATPart可以建立多个PowerCopy,但每个PowerCopy要在单独body里面。

二 Instantiate From Document命令

1 建立零件,此时建立一方块,欲在此方块上方放置一个已经存成PowerCopy的特征外形。选择Insert菜单中的Instantiate From Document命令。

2 选择PowerCopy原文件位置,打开原文件。

3 此时即出现Insert Object对话框,而Inputs选项卡可选择此特征的建构标准,若将此特征建构在方块的表面上,则单击欲放置特征的表面。

4 单击Parameters选项卡,即可更改已经Published的参数。

5 单击OK按钮,注意延伸方向,即可在此建立特征。

三 应用Catalog

1 建立Catalog,在Chapter.1下用Add Family添加Family

2在ComponentFamily.2下用Add Component添加Component。添加Component时要选择Select external feature,然后去点MYPOWERCOPY01.CATPart里的myPowerCopy01,所以执行这一步之前首先要打开MYPOWERCOPY01.CATPart。

4建立Catalog时,有几点需要注意

要用feature,不要用document

可以用一个feature连接一个CATPart中的一个PowerCopy

可以用两个feature分别连接一个CATPart中的两个PowerCopy

商务写作指南:超好记的appreciate的用法

WRONG: We would appreciate if you corrected the entry in the register as soon as possible. 错误用法:如果你能尽快更改登记处的入口,我将非常感激。 RIGHT: We would appreciate it if you corrected the entry in the register as soon as possible. 正确用法:如果你能尽快更改登记处的入口,我将非常感激(英语原句比前者多了一个it)。This is a very common mistake, and remember that when you use the phrase “I would appreciat e…”you MUST include the word “it”before “if”: 这是一个常见错误,记住当你要用“I would appreciate…”这个表达式时,一定要在if前加一个it。 More examples: 更多例子: E.g.1:I am sure the supervisory authority would not appreciate it if you took that course of action. 例1:我相信监督部门对你的所作所为不会表示欣赏。 E.g.2:We would appreciate it if you would arrange for immediate payment. 例2:如果您能立即付款,我们将很感激。 There is no need to add “it”if you do not include “if”. 如果你不用if从句的话,就没有必要在appreciate后面加it了。 E.g.: We would much appreciate a letter informing us of the result of your enquiries. 例句:如果您能对您的询盘结果给我们回信的话,我们将非常感激。 An alternative phrase to “I would appreciate it if…”is, “I would be grateful if…”This is the more formal phrase of the two and does not require that troublesome“it”! “I would appreciate it if…”这个表达式的替代用法有“I would be grateful if…”,但是这个用法更为正式,而且不需要加那个麻烦的“it”!

英语语法专项:动名词用法讲解及练习(附答案)

你听过英文语法有动词(verb)、名词(noun);但你听过有动名词(gerund)吗? 1. The girl is singing a song. 2. The girl singing now is my sister. 3. Singing is one of her hobbies(爱好). 三个句子中都有singing。第一个句子的singing是常见的现在进行式(Present Continuous),是说眼下正在做什么;第二个句子的singing是现在分词(Present Participle),它把sing这个动词转为形容词,但仍有动词的成份(哈哈,这么一说,要把你搞晕了吧:-) 。关于分词,以后有空再谈OK?)。好戏在后头,你看看第三个句子的singing到底是什么东东呀?原来就是我们的主角动名词(Gerund)了!憧矗瑂ing原本是个动词,可是现在它加上ing后,看来竟像是一个名词了。 一、名词性的动名词(Nominal Gerund) Nominal Gerund 可以加上定冠词(Definite article,如the)或不定冠词(Indefinite article,如a, an),其他可加在动名词前的还有如:my, this, some, any, all, no 等等。举例如下: 1. The mellow(愉快地) singing of the birds announces the coming of spring. (singing前加定冠词the及形容词mellow;coming 前加the) 2. We knew the robber was near when we heard a faint rustling(沙沙声) in the bushes. (rustling 前加不定冠词a及形容词faint) 从上面的例子可看出如何将一个动词转成名词;但它和真正的名词还是有区别的,那就是没有单数或复数之分。不过,有一些动名词是可以变成真正名词的喔,如:saying, writing, opening, painting, cutting, heading, feeling, being,saving, surrounding, crossing, misunderstanding 等等。它们都可以有复数的喔,方法就是在它们的后面加个s,如:paintings。 二、动词性的动名词(Verbal Gerund) 看看下面的句子: Carelessly writing essays annoys the teacher. 上面的句子里的writing是动名词,但前面有副词carelessly(粗心地),后面又有受词(Object) essays。因此writing就有动词的特征。 注意:Verbal Gerund 这类动名词的前面可不能加上任何冠词(the, a, an ...)喔。 动名词的功能与用法 一、在句子中用作主语(Subject)或主语的补语(Subject Complement): 1.1 作主语 1. Listening to music gives me pleasure. (主语Listening ) 2. Running is good exercise. (主语running) 3. Walking to school is a good idea. (主语walking) 1.2 作主语的补语 1. My cat's favorite activity is sleeping. (补语sleeping) 2. Seeing is believing. (主语seeing, 补语believing) 1.3 主语置于句尾 1.3.1 用It + be + ... +v-ing 句型 1. It is fun speaking English. 2. It is of great importance fighting against pollution(污染).

外研版英语非谓语动词的用法大全及答案解析推荐精选

外研版英语非谓语动词的用法大全及答案解析推荐精选 一、非谓语动词 1.The boss asked Tim to go and out if there was anyone else absent. A. find B. finding C. to find D. found 【答案】A 【解析】【分析】句意:如果有其他人缺席,老板让蒂姆去弄清楚。and前后并列,前面是动词不定式to go,此处要省略动词不定式to,故此处为动词原形find,故选A。 【点评】本题考查非谓语动词。当and链接动词不定式的时候后面一个不定式省去to。 2.—I think the environment is terrible these years. —Yes, it will be even worse the government takes action it. A. until; protect B. unless; to protect C. if; protecting 【答案】 B 【解析】【分析】句意:——我认为这几年来环境太糟糕了。——是的,环境会变得更糟糕,除非政府采取措施保护环境。A. until; 直到…为止,B. unless除非,如果不,连词;C. if 如果,连词;until和if放在这里,句意不通顺,take action to do sth. 采取行动去做某事,动词不定式作目的状语,故选B。 【点评】此题考查连词短语和固定搭配。 3.My mother doesn't allow me _______outside too late on school nights. A. to stay B. stay C. staying 【答案】 A 【解析】【分析】句意:在上学的日子里,我妈妈不允许我在外面待得太晚。Allow sb to do sth允许某人做某事,是固定用法,故答案选A。 【点评】考查动词不定式,掌握固定搭配。 4.—You can only keep the books for two weeks, Tom. Remember ____them on time. —I will. A. return B. returning C. to return 【答案】 C 【解析】【分析】句意:—这些书你能借两周,汤姆,记住按时归还它们。—我会的。remember to do记住去做某事; remember doing记得做过某事。根据You can only keep the books for two weeks, 可知借了之后要记得去还,记得去做某事要用to do,故选C。 【点评】考查remember的用法。牢记remember to do和remember doing的不同。 5.As a volunteer,the girl wants to visit sick kids in the hospital them up.() A. to cheer B. cheer C. cheering D. cheered 【答案】 A

appreciate表示感谢的用法

外教一对一https://www.360docs.net/doc/5c6794434.html, 用appreciate表示「感谢」,用对不容易 在邮件里表示「感谢」的时候,我们常常会用到appreciate一词;在比较正式的场合,你也会偶尔听到有英美人在口语中使用appreciate 来表示「感谢」的含义。本帖将教会大家如何用对appreciate一词。1)表示感谢的时候,appreciate的对象通常不是某人,而是某件事。 和动词thank不一样的地方在于:thank 后面常常是某人。比如:Thank you for doing sth。但是appreciate后面常常是某件事,比如:I really appreciate your help. 很感谢你的帮助。Your support is greatly appreciated. 很感谢你的支持。以上的两个例句,通常都用在帮助或者支持完成之后说。而下面的这句话,是我们邮件中最常用的句式:I would appreciate it if you paid in cash. 如果你用现金支付,我会非常感谢。这个邮件的高频句式其实很容易出错,注意以下三点:appreciate后面的it不能漏掉appreciate后面不能直接加you以上面的句子为例,主句里的would和从句里的paid使用了过去式,是为了让语气更加婉转,而非表达过去的含义。I will appreciate it if...do...这样的句式也正确。2)中文里可以「欣赏」某人的品质;appreciate也一样。 中文里「欣赏」一词有两层含义:领略欣赏。比如:欣赏一段音乐认为……好。比如:老板很欣赏他的才华。巧合的是,appreciate 也有这两层含义:领略欣赏。You can't fully appreciate foreign literature in translation. 看翻译作品很难欣赏到外国文学的精髓。认为……好。His talents are not fully appreciated in that company. 在那个公司,他的才能得到充分地赏识。丨There's no point buying him expensive wines - he doesn't appreciate them. 别给他买很贵的酒,他不懂得品赏。3)appreciate还有一层生僻的含义:增值 我们会在财经新闻里看到appreciate及其反义词depreciate,分别表示「增值」和「贬值」。Their investments have appreciated over the years. 他们的投资在几年间增值了。currency depreciation 货币贬值 文章来源:https://www.360docs.net/doc/5c6794434.html,

高中现在分词的用法

高中英语现在分词的用法 1)- ing分词(短语)作主语: 1. 动词-ing 形式作主语表示抽象的或泛指的动作, 谓语动词用单数。如: 1. Talking to him is talking to a wall. 对他说话等于对牛弹琴。 2. Smoking may cause cancer. 吸烟会致癌。 3. Walking is my only exercise. 散步是我唯一的运动。 4. Talking mends no holes. (谚)空谈无济于事。 5. Saying is easier than doing. 说比做容易。 1. 为了保持句子平衡,通常用作形式主语,而把真实主语放在句末。如:It is no use crying over spilt milk. 作无益的后悔是没有用的。 It's a waste of time arguing about it. 辩论这事是浪费时间。 常见的作表语的名词或短语有:no use, no good, fun, hard work, a hard / difficult job, a wonder, a waste of time 等。如: It is worthwhile discussing with her. It 's no good waiting here. Let 's go home. It was a waste of time reading that book. 2. 动词-ing形式的否定形式是在其前面加not。如: Your schoolmate 's not coming home made her parents worried. 2)-ing 分词(短语)作宾语: 1. I suggest ending the meeting. 我建议结束会议。 2. He admitted taking the money. 他承认钱是他拿的 3. I couldn ' t help laughing.

appreciate用法

appreciate的习惯用法 1. 其后可接名 (代)词、动名词、名词性从句等作宾语,但不能接不定式: We shall appreciate hearing from you again. 能再次收到你的来信,我们将十分感激。 I appreciate that you have come here so early. 感谢你来得这么早。 2、习惯上不用“人”作宾语,其后只能接“事”作宾语,而不能接“人”作宾语 (注意:这与thank 的用法恰恰相反): 正:I appreciate your kindness. 谢谢你的好意。 误:I appreciate you for your kindness. 正:He thanked her for her kindness.他感谢她的好意。 误:He thanked her kindness. 3. 关于修饰语的搭配习惯,表示程度,可用 deeply, highly, (very) much 等修饰: I deeply appreciate your kindness. 我深深感谢.. He highly appreciated their help. 他非常感谢.. 注意:much 修饰 appreciate 时,只能置于其前,而不能置于其后,但 very much 却可以):我们非常感谢你的邀请。 正:We much appreciate your invitation. 正:We appreciate your invitation very much. 误:We appreciate your invitation much.

人教版英语非谓语动词的用法大全含答案解析百度文库

人教版英语非谓语动词的用法大全含答案解析百度文库 一、非谓语动词 1.I really don't know this question. It is too hard. A. which to answer B. how to answer C. what to answer 【答案】 B 【解析】【分析】句意:我真的不知道如何回答这个问题。它太难了。which to answer回答哪一个; how to answer怎么回答;what to answer回答什么;据It's too hard.可知此处指的是这个问题太难,不知道如何回答,选B 2.My friend invited me ______ the Art Club , and I accepted it with pleasure. A. join B. to join C. joined D. joining 【答案】 B 【解析】【分析】句意:我的朋友邀请我参加艺术俱乐部,我愉快地接受了。A.动词原形;B.动词不定式;C. 动词过去式;D.动词的ing形式。invite sb. to do sth.邀请某人做某事。结合句意及结构,故选B。 3.As a volunteer,the girl wants to visit sick kids in the hospital them up.() A. to cheer B. cheer C. cheering D. cheered 【答案】 A 【解析】【分析】作为一名志愿者,这个女孩想去看望医院里生病的孩子使他们振作起来.根据句意可知这个女孩想去看望医院里生病的孩子的目的是使他们振作起来,故该空处填入动词不定式作目的状语,故填to cheer,故选A 4.As we all know, a person learns many things by making mistakes and ________ them. A. corrects B. correct C. to correct D. correcting 【答案】 D 【解析】【分析】句意:正如我们所知,一个人通过犯错误和纠正错误中,能学会很多东西。and,表并列的连词,前后动词用法应该一致,根据making,可知此处用动词ing形式,因此用correcting,故选D。 【点评】考查固定搭配。注意介词后接动词的ing形式。 5. You should ask Bob ________ his own clothes. He is ten years old now.

英语词汇正误辨析 arouse正误用法

英语词汇正误辨析arouse正误用法 ■这本书引起了我对政治的兴趣。 误:The book aroused at my interest in politics. 正:The book aroused my interest in politics. 析:arouse(引起,激起,唤起)是及物动词,其后接宾语时,无需用任何介词。顺便说一句:arouse 的宾语通常兴趣、怀疑、愤怒、同情、批评、讨论等较抽象的东西。 ■演讲者激起了听众的愤怒。 误:The speaker aroused the audience with anger. 正:The speaker aroused the audience to anger. 析:表示激励或唤起某人做某事,通常用arouse sb to sth,注意通常用介词to,其实此句也可说成:The speaker arousedthe anger of the audience.又如:He tried to arouse her to action.(他试图要使她采取行动)。 ■能再次收到你的来信, 我们将十分感激。 误:We shall appreciate to hear from you again. 正:We shall appreciate hearing from you again. 析:appreciate(感激)后接动词时,要用动名词,不用不定式。 ■谢谢你的好意。 误:I appreciate you for your kindness.

正:I appreciate your kindness. 正:Thank you for your kindness. 析:其后只能接“事”作宾语,而不能接“人”作宾语,此用法与thank 的用法恰恰相反。 ■如果你能帮助我做这事,我将十分感激。 误:I would appreciate very much if you would help me with it. 正:I would appreciate it very much if you would help me with it. 析:appreciate(感激)是及物动词,其后不能没有宾语。另外也有的词书(如《朗文当代英语词典》)将I would appreciate it if...视为一个固定句型。另外有时其中的if从句也可能换成when从句。如:We really appreciate it when she offered to help.(她来帮忙了,我们十分感激)。

表语从句用法详解

表语从句用法详解(例句丰富) 一、表语从句的引导词 引导表语从句的词有连词that, whether,连接代词和连接副词,关系代词型what,以及as if, as though, because等连词。 1. 由that引导 The fact is that he doesn’t really try. 事实是他没有做真正的努力。 The trouble is that I have lost his address. 麻烦的是我把他的地址丢了。 My suggestion is that we should tell him. 我的建议是我们应该告诉他。 His sole requirement was (is) that the system work. 他唯一的要求是这个制度能起作用。 My idea is that we should start making preparations right now. 我的意见是我们马上就开始做准备工作。 2. 由whether引导 The question is whether the film is worth seeing. 问题是这部电影是否值得看。 【注意】whether 可引导表语从句,但与之同义的if却通常不用于引导表语从句。 3. 由连接代词引导 You are not who I thought you were. 你已不是我过去所想像的人。 The problem is who we can get to replace her. 问题是我们能找到谁去替换她呢。 The question is who (m) we should trust. 问题是我们应当相信谁。 What I want to know is which road we should take. 我想知道的是我们应走哪条路。 4. 由连接副词引导 The problem is how we can find him. 问题是我们如何找到他。 That was when I was fifteen. 这是我15岁时发生的事。 That’s where I first met her. 那就是我第一次遇见她的地方。 That’s why he didn’t come. 这就是他没有来的缘故。 That’s why I object to the plan. 这就是我反对这个计划的原因。 That’s where you are wrong. 这就是你不对的地方。

英语被动语态用法详解

英语被动语态用法详解 一、单项选择被动语态 1.As is estimated, more than 20 million shared bikes ______ into operation nationwide by 2025. A.will have been put B.will have put C.have been put D.will be putting 【答案】A 【解析】 【详解】 考查动词时态语态。句意:据估计,到2025年为止,全国将有2000多万辆共享单车投入运营。根据by 2025可知应用将来完成时,且主语与谓语动词构成被动关系,故应为将来完成时的被动语态。故选A。 2.(桂林部分学校高三质量检测)The wet weather will continue tomorrow,when a cold front________to arrive. A.will be expected B.is expecting C.expects D.is expected 【答案】D 【解析】 考查动词的时态和语态。句意为:预计将有一股冷锋到来,因此潮湿的天气明天将会继续。a cold front与expect之间是逻辑上的动宾关系,expect是发生在现在的动作,要用一般现在时,故选D项。 答案:D 3.—The manager has come back from his business trip. He is asking you for the report. — Oh,my god ! I haven’t finished it yet. But he ________ back at the company tomorrow. A.was expected B.will expect C.expected D.will be expected 【答案】A 【解析】 试题分析:考查时态和语态。句意:——经理出差回来了。他正在问你要报告。——哦,天哪,我还没完成呢。但是本来预计他明天回公司。根据语境,是过去预料他明天会回来,而且经理是被预计,故用一般过去时的被动。故选A。 【名师点睛】时态的考查要根据本句的句意,这句话一定要根据上下文判断动作发生的时间,要细心体会语境。还要注意时态语态。 考点:考查时态和语态 4.—Will Uncle Peterson come to my birthday party tomorrow? —Pity he ______ to Zimbabwe as a volunteer teacher. A.was sent B.has been sent C.had been sent D.would be sent

现在分词用法总结

现在分词 一、基础知识: 现在分词(也叫动名词):表示主动和进行。 基本形式:doing 否定式:not doing 被动式:being done 完成式:having done 二、具体用法: 1.动名词作主语和宾语: (1)把一个动词变成-ing形式可以当做名词来用,表示一种经常性、习惯性的动作,可在句中充当主语和宾语。 eg: Working with you is a pleasure. I like reading in my free time. (2)可以用it做形式主语或形式宾语放在前面,再用动名词做真正的主语或宾语放在后面,这种用法常用于以下句式: ①It is/was no use/good doing sth. 做某事是没用的/没有好处的。 eg: It’s no use begging for his mercy. It’s no good smoking too much. ②It is/was a waster of time doing sth. 做某事是浪费时间的。 eg: It is a waste of time copying others’ homework. ③It is/was worth doing sth. 做某事是值得的。 eg: It was worth making the effort. ④There is/was no sense in doing sth. 做某事是没有道理的/意义的。 eg: There is no sense in arguing with your wife. ⑤There is/was no point (in) doing sth. 做某事是没用的/无意义的。 eg: There is no point in getting angry. ⑥There is no shame in doing sth. 做某事是不丢脸的。 eg: There is no shame in saying sorry to your friends. ⑦There is no telling…无法预言会… eg: There is no telling what will happen. ※注意:动名词作主语时,其前可用名词所有格和形容词性物主代词修饰,即one’s doing sth.作主语。 eg: Tom’s being late again made his teacher angry. My going to Beijing University is my parents’ biggest dream. (3)动名词作宾语分为两种情况:动名词后的宾语和介词后的宾语 ①有些动词后只能接动名词作宾语,常见的有: avoid, advise, allow, admit, appreciate, consider, deny, enjoy, keep, finish, suggest, dislike, delay, risk, escape, imagine, mind, miss, permit, practice, fancy, can’t help, be busy, give up, can’t stand, feel like等。 eg: You must avoid being hurt when crossing the road. ②有些动词后即可接动名词也可接不定式作宾语,常见的有: A: start, begin, intend, attempt, continue等后接doing和to do无区别。 B: like, love, prefer, hate等后接doing和to do略有区别,后接doing侧重经常习惯性的行为,后接to do侧重具体的某一次行为。 eg: I like swimming in summer but today I like to see a film at home

动词以及动词短语的用法(动词后加to do 还是doing)

一动词加-ing 的情况 consider, suggest/advise,look forward to, excuse/pardon admit,delay/put off,fancy avoid,miss,keep/keep on,practise deny,finish,enjoy/appreciate forbid,imagine,risk can't help,mind,allow/permit,escape 考虑建议盼原谅, 承认推迟没得想. 避免错过继续练, 否认完成就欣赏. 禁止想象才冒险, 不禁介意准逃亡. 如:建议: 二动词后加 ①remember doing 的事,表示“不要忘记” ②forget doing。 ③mean doing表示“ ④regret doing 不是stop的宾语而是stop的目的状语。 ”,try to do表示“设法、试图做某事”。 go on to do表示做完一件事后,接下 三动词后加to do sth. afford负担得起agree同意appear似乎,显得arrange安排 ask问attempt企图beg请求begin开始 choose选择claim要求decide决定demand要求 desire愿望determine决定expect期望fail不能 forget忘记happen碰巧hate憎恨,厌恶hesitate犹豫 hope希望intend想要learn学习long渴望 love爱manage设法mean意欲,打算need需要 neglect忽视offer提供omit忽略,漏other扰乱;烦恼

动名词的用法详解

动名词的用法详解 今天给大家带来动名词的用法详解,我们一起来学习吧,下面就和大家分享,来欣赏一下吧。 英语语法:动名词的用法详解 动名词因同时拥有动词和名词两者的特点而拥有及其丰富 的用法,熟练的掌握这些用法不仅可以使口语表达更地道生动,也能在写作中增分添彩。 动名词主要有四种用法,做主语,作宾语,作表语,作定语,每种用法下又分小类别,是一个非常复杂庞大的系统,学习者们往往会理不清脉络,今天就为大家带来动名词的用法讲解。 一.作主语 1.直接位于句首 eg.Swimming is a good sport in summer. 2.用it作形式主语,把动名词(真实主语)置于句尾作后置主语。 eg.It is no use telling him not to worry.

.mportant,essential,necessary等形容词不能用于上述结构。 3.用于“There be”结构中 eg.There is no saying when hell come. 4.动名词的复合结构作主语: 当动名词有自己的逻辑主语时,常可以在前面加上一个名词或代词的所有格,构成动名词的复合结构,动名词疑问句通常使用这种结构做主语 eg.Their coming to help was a great encouragement to us. Does your saying that mean anything to him? 二.作宾语 1.作动词的宾语 某些动词后出现非限定性动词时只能用动名词作宾语,不能用不定式。不定式通常指某种特定的动作,但动名词表示泛指,常见的此类动词有: admit,appreciate,excuse,stand,advise,allow,permit,avoid,consider,e njoy,finish,give up,cannot help,imagine,include,keep,understand,keepon,mind,report,risk,mis s,put off,delay,practise,resist,suggest,depend on,think about,set about,succeed in,worry about,burst out,insist on,feel like,be used

非谓语动词用法难点解析

非谓语动词用法难点解析 1.不定式和动名词作主语的区别 (1)动名词作主语通常表示抽象动作;而不定式作主语表示具体动作。 Smoking is prohibited(禁止)here.这里禁止抽烟。(抽象) It is not very good for you to smoke so much.你抽这么多烟对你身体很不好。(具体) (2)动名词作主语时,通常用以表示一件已知的事或经验。 不定式短语通常用来表示一件未完成的事或目的。 Climbing mountains is interesting.爬山很有趣。(经验) To finish the job in two days is impossible. (3)不定式做主语,一般用it当形式主语,把作主语的不定式短语后置。 It took me only five minutes to finish the job. (4)动名词作主语的句型 1)Doing...+ v. Reading is an art.阅读是门艺术。Seeing is believing.眼见为实。 2) It is + no use, no good (fun, a great pleasure, a waste of time, a bore...)等名词+doing sth. It is no use crying.哭没有用。It is no good objecting.反对也没有用。 It is a great fun playing football.打篮球很有趣。 It is a waste of time trying to explain.设法解释是浪费时间。 3)It is + useless (nice, good,interesting, expensive等形容词)+ doing sth. It is useless speaking.光说没用。 It is nice seeing you again.真高兴又遇到了你。 It is good Playing chess after supper.晚饭后弈棋挺好。 It is expensive running this car.开这种小车是浪费。 2.不定式、动名词和分词作表语的区别 (1)不定式作表语 1)不定式作表语一般表示具体动作,特别是表示将来的动作。 To do two things at a time is to do neither.--次做两件事等于未做。 What I would suggest is to start work at once.我的建议是立刻开始干。 2)如果主语是不定式(表示条件),表语也是不定式(表示结果)。 To see is to believe.百闻不如一见。 To work means to earn a living.工作就是为了生活。 3)如果主语是以aim,duty,hope,idea,happiness,job,plan,problem,purpose,thing,wish 等为中心的名词,或以what引导的名词性从句,不定式作表语是对主语起补充说明作用。 His wish is to buy a luxurious car in the near future.他的希望是在不远的将来买一辆豪华轿车。 The function of Louis Sullivan's architecture was to provide large uninterrupted floor areas and to allow ample light into the interior. The most important thing is to negotiate with them about the future of the plant. (2)动名词作表语:动名词作表语,表示抽象的一般性的行为。 Our work is serving the people.我们的工作是为人民服务。 His hobby is collecting stamps.他的爱好是集邮。 (3)分词作表语 分词做表语有两种情况,一种是现在分词做表语,一种是过去分词做表语,这两者区别是考试中经常考到的地方。一般来说,表示心理状态的动词如excite,interest等都是及物动词,汉语意思不是“激动”,“高

过去分词用法详解

过去分词的用法 一、构成:规则动词的过去分词是有动词原形+ed构成的,不规则动词则有各自构成。 二、基本特点:过去分词在句子中的基本用法有两点:1.与逻辑主语之间是被动关系 2.表示完成的动作 三、过去分词的用法: 1.作表语:过去分词作表语时,一般同时具备被动与完成的含义 例如:(1)The cup is broken.(2)He is retired. (3)After running,he is tired. 【注意】过去分词作表语时,已经变成形容词性质,主要表示主语的状态(被动完成),而被动语态则表示动作. 例如:(1) The cup was broken by my little sister yesterday. 茶杯是昨天我小妹打碎的.(是被动语态,表示动作) (2)The cup is now broken. 茶杯碎了.(过去分词作表语,表示状态) 【注意】有些动词如 interest, bore, worry, surprise, frighten 等通常用其过去分词形式来修饰人,表示“感到……” 用 -ing 形式来修饰物,表示“令人……” 例如:The book is interesting and I'm interested in it. 这本书很有趣,我对它很感兴趣. 2.做定语 作定语用的过去分词其逻辑主语就是它所修饰的名词.及物动词的过去分词作定语,既表被动又表完成;不及物动词的过去分词作定语,只表完成.

1)单一过去分词作定语,常置于其所修饰的名词之前,称作前置定语。 例如:We must adapt our thinking to the changed conditions. 我们必须使我们的思想适应改变了的情况. 2)过去分词短语用作定语时,一般置于其所修饰的名词之后,相当于一个定语从句,称作后置定语。 例如:The concert given by their friends was a success.他们朋友举行的音乐会大为成功. 3)过去分词短语有时也可用作非限制性定语,前后常有逗号. 例如:The meeting, attended by over five thousand people, welcomed the great hero. 4)用来修饰人的过去分词有时可以修饰与人有关的表情,面貌,举止行为以及感觉等,这时不能用v-ing形式 例如:The boy looked up with a pleased expression. His satisfied look showed that he had passed this exam. 3.作状语 作状语的过去分词在句子中多表示被动和完成两重含义。 1)时间状语:A.当和谓语动词动作同时发生时,一般仅表示被动,可以用when从句代替。 例如:Faced with difficulties,we shouldn’t withdraw for any excuse. B.当表示动作发生在谓语动词之前时,通常既表被动又表完成,可用after从句代替,也可用现在分词的被动完成形式代替。 例如:Caught by the police,the thief lay on the ground,crying and shouting.

史上最全的 构词法 用法详解

史上最全的构词法用法详解 语言中词的总和构成词汇,但是词汇并不是一堆杂乱无章、互不相关的群体,而是一个严密体系,在这个结构的体系中,词与词之间有着各种各样的联系。英语中的这些联系的规律总结起来就是构词。英语中构词的方法就是构词法。构词法主要有合成法、转化法、派生法和缩略法四种。掌握构词法是迅速扩大词汇量的重要方法之一。 第一节合成法 合成法就是指由两个或两个以上的单词合成的词叫合成词。这种构词方式主要有两种:复合法、结合法。合成法主要是构成合成名词和合成形容词。 复合法构成的复合词,它们各个结合的部分相互间的语法关系是紧密相关的。如blackboard和darkroom都是形容词和名词形成的结构,wr it ing desk是动词名词和名词形式的结构。 结合法形成的词是形态合成词,它的结合是用一个起来连接作用的中缀来把两个或两上以上的词根词素紧紧的连缀在一起。如,用辅音字母-s-来缀全两个词根词素构成的词有:salesman, towns people等。 合成的方式常见的有如下几种: 一、合成名词 1、名词/代词+名词: woman-doctor, women-doctors, workshop, spaceship, he-goat, coal fire, motorcycle, gas cooker, oil well, power plant, silk worm, gold mine, bottleneck, piano keys, teleph one receiver, television screen, chairman, fireman, motorman, police-officer, postman, pine tree, girl friend, boy friend, goldfish, raindrop, birdcage, breakfast time, flowerbed, tearoom, 2、动词+名词:blowpipe, flashlight, watchdog, call-girl, searchlight 3、形容词+名词: blacksmith, blackboard, supermarket, superman, darkroom, blackbird, highchair, hothouse, greenhouse, madman 4、动名词+名词: reading-room, sitting-room, classroom, schoolroom, dining room, building materials, dancing girl, cleaning women, flying machine, washing machine, working conditions, boilding point, drinking water, swimming pool, drinking cup, typing paper, writing desk, sewing machine, walking stick,

相关文档
最新文档