注：有些不及物动词后习惯上也 接不定式，不接动名词： aim to do sth. 打算做某事 fail to do sth. 未能做某事 long to do sth. 渴望做某事 happen to do sth. 碰巧做某事 hesitate to do sth. 犹豫做某事 struggle to do sth. 努力做某事
2）动词+不定式 ； 动词+宾语+不定式 ask, beg, choose, expect , hate, help intend like, love, need prefer, prepare, promise, want, wish… I like to keep everything tidy. 我喜欢每件东 西都保持整洁。 I like you to keep everything tidy. 我喜欢你 年使每件东西都保持整洁。 I want to speak to Tom. 我想和汤姆谈话。 I want you to speak to Tom. 我想让你和汤姆 谈话。
接不定式（而不接动名词）作宾语的24个常用动 词 afford to do sth. 负担得起做某事 agree to do sth. 同意做某事 arrange to do sth.安排做某事 ask to do sth. 要求做某事 beg to do sth. 请求做某事 care to do sth. 想要做某事 choose to do sth. 决定做某事 decide to do sth. 决定做某事 demand to do sth. 要求做某事 determine to do sth. 决心做某事
3） 动词+疑问词+ to decide, know, consider forget, learn, remember, show, understand, see, wonder, hear, find out, explain, tell Please show us how to do that. 请演示给我们 如何去做。 There are so many kinds of tape-recorders on sale that I can't make up my mind which to buy.有这么多的录音机，我都拿不定主意买哪 一种。 注意:疑问词带不定式在句中作成分时，谓语动 词用单数。 The question is how to put it into practice. 问题是怎样把它付诸实施。


What she wants to do most now is (to) travel abroad. The most important thing is to take measures to prevent the pollution. 主语的内容或性质 表按计划要做的事情.
He is to marry Rose.
4.不定式作定语



I need a pen to write with. Charles Lindbergh is the first man to fly the Atlantic alone. The meeting to be held tomorrow is very important.
不定式在七个感官动词see, hear, feel, watch, find, notice, listen to, 三个使役动词 let, have, make等后作宾补时,to要省略
不定式运用口诀
本领最多不定式，主、表、宾、补、定和状。
样样成分都能干，只有谓语它不敢。 大家千万要当心，有时它把句型改， 作主宾时用“it”, 自己在后把身藏。
1) 动词+ 不定式 afford aim appear agree arrange ask be decide bother care choose come dare demand desire determine expect elect endeavor hope fail happen help hesitate learn long mean manage offer ought plan prepare pretend promise refuse seem tend wait wish undertake后直接加to do sth作宾语 举例： The driver failed to see the other car in time. 司机没能及时看见另一辆车。 I happen to know the answer to your question. 我碰巧知道你那道问题的答案。
一. 动词不定式的基本构成： 由不定式符号to加动词原形构成。其否定式由not+不定式构成
肯定式：to do sth 被动式：to be done 否定式：not to do sth. 完成式：to have done
二. 动词不定式的句法作用法
动词不定式有副词，形容词和 名词的特征，因此在句中可作 主语、宾语、宾语补足语、表 语定语、状语等成份。
非谓语动词的句法功能
名称 不定 式 动名 词 现在 分词 过去 分词
主语 √ √
法 功 能 宾语补 宾语 表语 定语 足语
√ √ √ √ √ √ √ √ √ √
语
状语 √
√
√
√
√
√
一、不定式
可充当成分:
主语 , 宾语, 宾语补足语, 表语, 定语, 状语.
动词不定式（The Infinitive）
七个感官三使役， 宾补要把to甩开； 疑问词后接上它，宾语从句可充当； 逻辑主语不定式，不定式前for sb. ;
to前not是否定， 各种用法区别开。
1.不定式作主语
To lose your heart means failure. It took me only five minutes to finish the job. To do two things at a time is to do neither．
②
like love hate prefer
+
to do doing
remember to do + ③ forget doing regret
④
try to do mean + doing stop go on
see watch look at hear listen to feel notice
2.不定式作宾语
You needn't bother to come yourself. They are considering what to do next. Some who were famous in their own times would find it difficult to achieve success today. afford、promise、refuse、expect、hope、 learn、offer、wish、want、fail、plan、 agree、forget、like、prefer、decide、 manage、try、arrange、determine、desire
接不定式作宾语的动词顺口溜 动词不定作宾语， 期希渴欲承担起； 愿望碰巧又出现， 假装安排不拒绝； 准备计划却失败， 好像提供又犹豫； 企图要把目标证， 等待要求作选择。
同意提出做计划， 要求答应来帮忙。 准备决定遭拒绝， 敢于选择有希望。 不能做到莫假装， 设法做成决心坚。
agree (同意)； offer (提出)； intend， plan (打算，计划)； demand， ask (要求)； promise (答应)； help (帮忙)； prepare (准备)； decide (决定)； refuse (拒绝)；dare (敢 于)； choose (选择)； wish，hope，want， expect (希望， 想要)； fail ；（不能；忘记）； pretend (假装)； manage (设法)； determine （决心）。
2. I don’t know whether you happen , but I’m going to study in the U.S.A. this September . A．to be heard B．to be hearing C．to hear D．to have heard
3.不定式作表语
(1)作主语 不定式做主语时，可以直接放在谓语动词之前。
To see is to believe． Not to get there in time is your fault. 注：常用it做形式主语，将to do放在位于 之后，使句子保持平衡。 句型1：It + 谓语 + to do It takes us an hour ___ get there by bus.
It is + adj + for sb to do sth （是形容事物的性质的 ） It is + adj + of sb to do sth （是形容人的品质的 ）
It is easy for me to finish this work before ten. It is a great honor for us to be present at your birthday party. It is very kind of you to give me some help. ＝You are very kind to give me some help. It's impolite of you to speak to the teacher like that. ＝you are impolite to speak to the teacher like t定式