Unit1 动词不定式的用法总结.doc

Unit1 动词不定式的用法总结动词不定式由：“to +动词原形”构成，其否定形式是“not to do”。不定式可以带宾语或状语构成不定式短语，没有人称和数的变化，但有时态和语态的变化。不定式具有名词特征，可作主语、宾语、状语、表语和定语，但不能单独作谓语。不定式的用法：作主语。不定式短语作主语时，往往放在谓语动词后，用it 作形式主语。To see is to believe.It is possible to live an independent and fulfilling life.(P4)作宾语。不定式短语作宾语时，如果还带有宾语补足语，往往把不定式宾语放在宾语补足语之后，而用it作形式宾语。常见的带不定式作宾语的动词，begin, continue, hope, decide, want, wish, try, learn, afford, agree, manage, refuse等等。He wanted to go.I find it interesting to study English.I have learned to adapt to my disability.(P2)作宾语补足语。(ask, tell, order, cause, allow, want, like , advise, force, permit, get等)He asked me to do the work with him.注意：在feel, hear, listen to, look at, notice, observe, see, watch, have, let, make等词后的补足语中，不定式不带to，但是这些句子如果变成被动结构，就必须带to。I often hear him sing the song.He is often heard to sing the song.She was invited to become the headteacher of the first online school for disabled students.(P4)作定语。不定式作定语常放在所修饰的名词或代词的后面。Let us give him something to eat.He is looking for a room to live in.The family village website gives ordinary young people with a disability the chance to tell their personal stories.(P2)作状语。表目的，原因，结果或条件。目的状语可用：in order to, so as toI came here to see you.Check your composition so as to avoid mistakes.Next year he will be trained to be a teacher.(P1)结果状语可用：enough to, soas to, tooto, only toHe lifted a rock only to drop it on his own feet.Some days I was too tired to get out of bed.(P2)原因状语可用：sb.+ adj.+to doI am glad to help you.She was proud to have recently represented her country.(P1)条件状语 To look at him, you would like him.作表语。My job is to help patients.His ambition is to become an actor.(P1)作独立成分。To tell the truth, I dont agree with you.常见的词还有：to be frank(坦白地说)，to be exact（确切地说）, to begin with(首先)。不定式与疑问词who, which, when, where, how ,what, 等连用在句中起名词作用，可充当主语，宾语和表语等。He didnt know what to say.How to solve the problem is very important.So they dont know how to make me well.(P2)不带to的不定式1）在使役动词feel, hear, listen to, make, let, have, see, look at, watch, notice, observe后不定式作宾补时省略to。2）在would rather(would sooner, had rather, had sooner)than, rather than等结构的than之后用不带to的不定式。 I would rather go than stay. He insisted on going back to his work rather than stay in hospital.3）在以why引导的疑问句中不带to。 Why worry about it? Why not do it right now?4）在cannot but, cannot choose but, cannot help but之后的不定式不带to。 I cannot but admire his courage.5）不定式动词在介词but, except, besides后面时，如果这些介词之前有行为动词do的 各种形式，那么，这些介词后的不定式不带to,否则要带to。 She could do nothing but cry. What do you like to do besides swimming? I have no choice but to accept the fact.6）为了避免重复，有时候不定式可省去to。 Im really puzzled what to think or say.7）不定式作表语时，在下列情况下可省略to：当含do的定语从句或含do的不定式修饰all, all that thing, the only(first, last) thing,且它们是该主句（该句）的主语时，作表语的不定式的to可省去。All we do is (to) work.All that thing I want to do now is (to) drink some water.The only thing to do is (to) run away.The first thing to do is (to) have breakfast.当主语时含do的主语从句时，作表语的不定式的to 可省。What