有关to do不定式的,to do不定式什么时候可以省略to do;还有什么时候用被动形式,什么时候不用。
不定式符号to的省略
不定式符号to的省略不定式符号to的省略1．不定式作宾补省to:在英语中有的动词用不定式做宾补时需要省略不定式符号to。
可以这样进行记忆如下动词：二感觉：feel；perceive二听：hear; listen to；三让：have ; let ; make [have or let及少用被动] 五看：see; watch; notice; observe; look at。
共12个。
Whenever something is wrong with you, please do let me know.I will have the students write a passage about Internet.On seeing the young child fall into the lake, John sprang to his feet, and went to the rescue.Who are you going to have type this letter for you?Who would you rather have clean the room?It seemed so long before he heard the stone hit the water.Modesty helps one make progress while conceit makes one lag behind. 谦虚使人进步，骄傲使人落后。
He did not perceive anyone come in.他没有觉察到有人进来。
如果上述动词用被动语态时，不定式符号to不能省略。
Paul doesn't have to be made to learn. He always works hard.The fat boy was made to take more exercise to lose weight.He was angry to be made to pay double the price for it.The thief was perceived to steal into the house.有人看见小偷溜进那房子里去了。
to do不定式做定语的四种情况
to do不定式做定语的四种情况
1. 用于表示目的：to do不定式作为定语修饰名词，表示某个动作或行为的目的。
例句：I need a pen to write the letter.（我需要一支笔来写这封信。
）
2. 用于表示结果：to do不定式作为定语修饰名词，表示某个动作或行为的结果。
例句：She had a lot of work to do.（她有很多工作要做。
）
3. 用于表示限制：to do不定式作为定语修饰名词，表示某个动作或行为的限制。
例句：There is only one hour to complete the test.（只有一个小时完成这个测试。
）
4. 用于表示条件：to do不定式作为定语修饰名词，表示某个动作或行为的条件。
例句：He needs a key to open the door.（他需要一把钥匙来打开门。
）。
动词不定式
不定式作主语时,往往放在谓语之后, 用it作形式主语. (2). 表语
My job is to help the old. Your job is to clean the classroom.
I want to go home. She decided to work hard. They will try to learn English well I found it necessary to talk to him again.
6.—The light in the office is still on. --- Oh, I forgot ______. A.turning it off B. turn it off C. to turn it off D. having turned it off
7.---How do you deal with the disagreement between the company and the customers? ---The key ____ the problem is to meet the demand ____ by the customers. A.to solving, making B. to solving, made C. to solve, making D. to solve, made 8. ---What do you think of the school? ----It is a very good _____. A.school to study in B. school for children to study C. studying school D. school to study
一.结构 : o do (否定) not to do
英语中不定式（todo）的6种成分和2种独立用法
英语中不定式（todo）的6种成分和2种独立用法非谓语是英语学习的重点也是难点，很多同学对这个语法知识一直是处于比较懵的状态。
其实只要掌握非谓语所充当成分的用法就可以运用自如了。
非谓语，顾名思义就是不做谓语的动词的变化形式，即to do ，doing，done。
除了谓语，句子成分中还有主语、宾语、表语、宾语补足语、定语和状语。
下面看看不定式(to do)充当这6种成分的用法：一、不定式作主语1.To see is to believe. （这种情况不常用）2. It is important to learn English well.It 是形式主语，真正的主语是 to learn English well. 这种用法是常用的而且是考点！考点！考点！二、不定式作表语:常说明主语的内容、性质和特征或表动作将要发生。
1. My job is to keep the children safe.2.My task is to type the article.三、不定式做宾语1.He prefers to eat white bread and rice.2.He wants to play football.3.动词feel, find, make, think等后面，可以用it作形式宾语代替真正的宾语——动词不定式，句子结构是...feel / find / make / ... it+adj. / n.+to do...。
如：I find it difficult to remember everything.常接动词不定式作宾语的动词有：（需要记住）agree, afford, appear, ask, attempt；care, choose, claim；dare,decide,demand,deserve,determine；expect, fail, get, guarantee；hate, hesitate, hope, hurry；intend, learn, manage, offer,plan, prepare, pretend, promise；refuse, seem, tend, threaten；want, wish 等四、不定式做宾语补足语1.I'd invite her to have dinner at my house.2 . We should allow the children to choose their own clothes.Note 1: 带to的动词不定式作宾语补足语的动词主要有：要求允许提议(ask, allow, advise)，期望邀请鼓励(expect, invite, encourage)，教导告诉想要(teach, tell, want)，等待希望愿意(wait for, wish, would like / love)。
动词help后的不定式何时省略to
动词help后的不定式何时省略to当动词help后接不定式用作宾语或宾语补足语时，该不定式既可以不带to，也可以不带to，即用于help (to) do sth或help sb (to) do sth。
如：I helped (to) wash the car. 我帮忙洗车。
He helped (to) do the work. 他帮助做这工作。
We helped her (to) find her things. 我们帮她找东西。
I helped him (to) repair his bike. 我帮他修自行车。
但是，如果help用于被动语态，则其后不定式必须带to。
如：The boy was helped by a woman to collect his scattered coins. 那男孩由一个妇女帮他捡拾散乱一地的钱币。
另外，当不定式为否定式时，其中的to通常不宜省略。
如：How can I help my children not to worry about their exams? 我怎样才能帮助我的孩子们不为他们的考试着急呢?注：在美国英语中help之后的不定式多不带to。
在英国英语中help之后的不定式不带to时往往有帮助者参加不定式所表动作的含义，带to时则无此含义。
比较：He helped her lift the box. 他帮她抬那箱子。
(“他”参加了不定式lift所表的动作)He helped her to mount the bicycle. 他扶她上了自行车。
(“他”不参加不定式to mount所表的动作)help (sb) (with sth) | help (sb) (in doing sth)I need contacts that could help in finding a job.我需要能帮我找到工作的社会关系。
Jo will help us with some of the organization.乔将帮我们做一部分组织工作。
常见非谓语固定搭配
非谓语动词固定搭配一、to do不定式1.固定接to do的动词：want to do need to do plan to do promise to do承诺fail to do未能agree to do同意refuse to do拒绝decide/determine to do决定manage to do设法成功learn to do claim to do声称，宣称pretend to do假装afford to do负担得起choose to do选择demand to do要求expect to do期待happen to do碰巧hope to do希望prepare to do准备2.+宾+to do的动词：advise sb to do sth建议want sb to do sth希望/想要invite sb to do sth邀请allow sb to do sth允许permit sb to do sth允许ask sb to do sth要求encourage sb to do sth鼓励persuade sb to do sth劝说3.接to do表目的：in order to do sth.so as to do为了不能位于句首4.接to do表结果：only to do表意料之外的结果“却”too+adj./adv.+to do“太...而不能”e.g.：He hurried to the train station,only_to find_(find)the train had left.It is too late to go home.太晚了而无法回家。
5.the+序数词+to do“第几个做...”e.g.：He is the first to come,the last to leave.6.疑问代词+to dowhat,who,when,where,why,howe.g.：I don’t know how to learn English.7.to do的省略(保留to省略do)e.g.：Would you like to have dinner with me?I would like to.but,except(表除了)+to doe.g.：have no choice but to do sth.“除了...别无选择”注意：but前有do，后无to(to省略)have nothing to do but do sth.8.to do的固定句型1）It作形式主语It is/was+adj.+(of/for sb.)to do sth.e.g.:It is so kind of you to help me.It is difficult for me to learn English.区分：of：某人是...的adj修饰sb.for：对于某人来说...adj修饰to do不定式。
to do 不定式
To do 不定式不定式由“to do＋动词原形构成”其否定形式是“not to do”。
to do定式不能单独作谓语、不随主语的人称和数的变化而变化。
它有名词、形容词和副词的功能，但还保留动词的特征。
不定式可以带宾语或状语构成不定式短语，有时态和语态的变化。
不定式可作主语、宾语、状语、表语和定语。
不定式有时态和语态变化，具体结构如下表：1．不定式的用法1）作主语不定式短语作主语时，一般表示具体的、个别的、一次性的或具有将来意义的动作,谓语动词用单数。
To master a foreign Language requires painstaking effort (辛苦的努力).To combine theory with practice is a good way of learning.It＋动词＋宾语等＋ to do sthIt makes me sick to think about it.It does you a lot of good _____ _( swim) in the rivers.②It＋be＋表语＋ to do sthIt was rich to give up smoking.It was beyond me____ __( help)him.③It＋be＋表语＋ for sb. to do sth/for sth. to be done．It is important for you to attend that meeting.It is a good idea _ ___ the books ____ __ (give) to her.④It＋be＋表语＋of＋名词/代词＋to do sthIt is kind of you to offer me this lovely holiday.It was careless_ ___ you ___ ___( leave) your book on the bus.2）作表语：①动词不定式作表语，其主语常常是wish，idea，task，purpose，duty，job等表示意向、打算、计划的词。
总结不定式中可以省略to的情形讲解
总结不定式中可以省略to的情形讲解总结不定式中可以省略to的情形讲解总结不定式中可以省略to的情形讲解动词不定式的省略为了避免重复，我们常常把作宾语、宾补和谓语动词的一部分的不定式省略，只保留动词不定式的符号to。
现将常见省略不定式的几种情况通过实例加以简析，供大家参考：（1）—How about coming to my dormitory for a party? —I’d love to if it doesn’t make you so much trouble. （到我寝室参加聚会怎么样？----只要你不嫌麻烦，当然好啦）。
这里的知识点是：在hope, like, love, promise, want, wish等词后作宾语的不定式常省略。
再如：You could go outside for a party if you want to. （如果你想去参加聚会，你就去吧）She can get a chance of interview if she hopes to.（如果她喜欢这个职位，可以给一个面试的机会）—How about going for a picnic the day after tomorrow？—I’d like to, but I have no permission from my parents.（后天一起去野餐怎么样？------我倒是很愿意去呢，但是得不到我父母的.允许啊！）哎，小编不禁感叹，这位小朋友也是我小时候一样，干巴巴望着其他孩儿们玩耍。
（2）please do not stop the music until I ask you to.（我没通知你关掉音乐的话，请不要关。
）这里涉及到的知识点就是：在allow, ask, tell 等词后作宾语补足语的不定式常省略。
再如：Don’t touch the exhibits unless the assistants allow you to. （没有服务员的允许，你绝对不可以触摸这些展览品）。
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2014年8月4日17:10有关to do不定式的，to do不定式什么时候可以省略to do；还有什么时候用被动形式，什么时候不用。
•一、使役动词与to的省略当不定式用于let, make, have等使役动词后作宾语补足语，不定式必须省略to。
如：Let me have another cup of tea. 给我再来一杯茶。
She had him dig away the snow. 她让他把雪挖走。
They made him tell them everything. 他们强迫他把一切全告诉他们。
但是，当使役动词用于被动语态时，其后的不定式则必须要带to。
如：他被迫一天工作20小时。
误：He was made work twenty hours a day.正：He was made to work twenty hours a day.注意，表示使役意义的let和have很少用于被动语态。
另外注意，force, oblige等虽然也表示“使”，但它们后用作宾语补足语的不定式必须带to。
如：They forced her to sign the paper. 他们强迫她在文件上签字。
The law obliged parents to send their children to school. 法律要求父母送子女上学。
二、感觉动词与to的省略当不定式用于表示感觉的动词feel, hear, notice, observe, see, watch, look at, listen to等作宾语补足语时，不定式必须省略to。
如：We all felt the house shake. 我们都感觉这房子在震动。
I heard him go down the stairs. 我听见他下楼了。
Did you notice her leave the house? 她离开屋子你注意到了吗?I watched her get into the car. 我看着她上了车。
但是，当feel后用作宾语补足语的不定式为to be时，则不能省略to。
如：They all felt the plan to be unwise. 他们都认为这个计划不明智。
注意，当这些动词变为被动语态时，不定式前的to不能省略。
如：They were heard to break a glass in the next door. 听见他们在隔壁打破了一个玻璃杯子。
另外，若用作宾语补足语的不定式为完成式，则通常应带 to。
如：I noticed her to have come early. 我注意到她来得很早。
三、why (not) 与to的省略在why (not)…?之后的不定式不能带to。
如：Why argue with him? He’ll never change his mind. 为什么要跟他争论? 他永远不会改变自己的看法。
Why not try going by boat for a change? 为什么不试着坐船去，这样也可以换换花样?Why not wait till the winter sales to buy a new coat? 为什么不等到冬季大贱卖时再买一件新外衣呢?四、介词except / but与to的省略当不定式用作介词except或except的宾语时，该不定式有时带 to，有时不带 to，情形比较复杂，大致原则是：其前有do，不定式不带 to；其前没有 do，不定式通常带to。
如：He likes nothing except to watch TV. 除了看电视外，他什么都不喜欢。
It had no effect except to make him angry. 除惹他生气外，没产生任何效果。
There’s little we can do except wait. 除了等待我们没有什么办法。
I could do nothing except agree. 我除了同意，没有别的办法。
五、help与to的省略当动词help后跟一个不定式用作宾语或宾语补足语时，不定式可以不带to，也可以不带to。
如：Can you help (to) carry this table upstairs? 你能帮忙把桌子搬到楼上去吗?I have lost my watch. Will you help me (to) look for it? 我把表丢了，你能不能帮我找一下?但是，当help用于被动语态时，其后不定式必须带to。
如：Millie was helped to overcome her fear of flying. 米利被帮助克服了她的飞行恐惧。
另外，当不定式为否定式时，其中的to通常不宜省略。
如：How can I help my children not to worry about their exams? 我怎样才能帮助我的孩子们不为他们的考试着急呢?六、know 与 to 的省略不定式用于动词 know 之后作宾语补足语主要见于以下两类句型：一是用于“know+宾语+to be”：当 know 为现在式时，其中的 to 不能省略；当 know为过去式或完成式时，其中的to可以省略也可以保留。
如：I know him to be a fool.=I know (that) he is a fool. 我知道他是个傻瓜。
I’ve never known her (to) be late before. 我以前从不知道她迟到过。
二是用于“know+宾语+to do”：当 know 为现在式时，其中的 to 不能省略；当 know为过去式或完成式时，其中的 to 可以省略也可以保留。
如：They know him to have been a spy. 他们知道他过去当过间谍。
I never knew him (to) do such a thing. •我从未见过他干那种事。
I’ve never known it (to) snow in July before. 我以前从未听说过七月份会下雪。
注意，在被动语态中，不定式必须带 to。
如：He has never been known to tell a lie. •从未有人听说过他说谎。
另外，当其中的不定式为完成式时，to也不可省略。
如：They knew the man to have been a thief. 他们发现此人曾是个小偷。
I have never known her to have failed. 我从来没发现她失败过。
七、bid 与 to 的省略当bid表示“吩咐”时，用于其后作宾语补足语的不定式可以带to也可以不带to。
如：She bade me (to) come in. 她叫我进来。
He bade me (to) do the work. 他吩咐我去做那项工作。
但是，在当bid为被动语态时，其后的不定式必须带to。
如：I was bidden to do the work. 我被嘱咐去做那项工作。
八、不定式作表语与 to 的省略当不定式用作表语时，其中的 to 原则上是不能省略的。
如：His aim is to do two years’ work in one. 他的目标是一年干两年的工作。
This wall is to keep people out of the garden. 这堵墙为的是不让人到花园里来。
但有一种例外，那就是当主语部分有动词do的某种形式时，用作表语的不定式可以省略to。
如：What you first do is (to) mix the egg with flour. 你先得把鸡蛋和面粉和好。
All I did was (to) touch the window, and it broke. 我只不过碰了一下窗户，玻璃就碎了。
九、并列不定式与to的省略当两个或多个作用相同的不定式并列时，通常只需在第一个不定式前用 to，其余不定式前的 to 可以省略。
如：I’d like to lie down and (to) go to sl eep. 我想躺下睡觉了。
Will you go to see the film or (to) dance? 你要去看电影还是要去跳舞？I’ll go to see him myself and (to) ask him about it. 我将亲自去看望他并问一问那件事情。
但是，如果两者有对比关系，则后面不定式前的to不可省略。
如：To try and fail is better than not to try at all. 尝试而失败总比不尝试好。
十、固定搭配与to的省略1. let类固定搭配：let fall (无意中说出)，let fly(发射、攻击)，let go (放开)，let slip (放走)，live and let live (自己活也让别人活)等。
如：She let slip a chance to work abroad. 她错过了出国工作的机会。
The dog’s got a stick between his teeth and he won’t let go. 那狗叼着一根棍儿不松口。
He aimed carefully and then let fly. 他仔细瞄准之后便开了枪。
I guessed what was happening from a few words she let fall. 我从她说的几句话中猜出发生什么事了。
2. make类搭配：make believe (假装)，make do (凑合着用)等。
如：The boys made believe (that) they were astronauts. 男孩子们假扮成航天员。
We were in a hurry so we had to make do with a quick snack. 我们时间很紧，只好胡乱吃了顿小吃。
相关问题•2009-12-152个回答什么时候有用不定式的主动形式表示被动的意思•2013-03-171个回答不定式做定语时to什么时候省略•2009-02-082个回答请问：不定式承前省略什么意思啊？•2009-02-022个回答关于不定式主动表被动的问题。