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高中英语 不定式和动名词同步讲解和练习 译林牛津版必修5
5页1、动词不定式一、动词不定式概念解析动词不定式由“不定式符号to + 动词原形”构成,是动词的一种非谓语的形式,即其在句中不能单独作谓语。动词不定式具有下列属性:(1)动词不定式具有动词的性质,可以有自己的宾语和状语,也可以有时态和语态的变化;(2)动词不定式也具有非动词的性质,相当于一个名词、形容词或副词,可以在句中担任主语、宾语、宾语补足语、表语、定语和状语。二、动词不定式的形式1. 一般式:表示的动作通常与主要的谓语动作同时或几乎同时发生,或是在它之后发生。to do(主动) to be done(被动)2. 进行式:表示谓语的动作或情况发生时,不定式表示的动作正在进行。to be doing(主动)He pretended to be reading when I came in.3. 完成式:表示不定式的动作发生在谓语动作之前。to have done (主动) to have been done(被动)Im sorry to have lost your key.It has been an honor for me to have been invited to your c
2、ountry.4. 完成进行式:表示不定式的动作在谓语动作之前发生并一直进行着。to have been doing(主动)He was said to have been living in London for 20 years.三、动词不定式结构所充当的语法成分1. 作主语(1) 不定式短语在句中作主语To say is one thing and to do is another.To know oneself is difficult.(2) 用it作形式主语在很多情况下,人们通常用it作为形式上的主语,而把不定式移到谓语之后,使句子结构显得平稳一些。It is important to learn English.It seemed a pity to have wasted so much time.2. 作表语不定式作表语说明主语的具体内容或表示目的。His wish is to become an engineer.To live is to do something worthwhile.3. 作宾语(1) 作动词的宾语He wanted to go.Father
3、likes to listen to music in silence.注意:在fell, find, make, think, consider等动词后,如果宾语带有宾语补足语时,要用it作形式宾语,而把真正的宾语放在宾语补足语后。 I find it interesting to study English.I think it impossible to work out the problem.(2) 作介词的宾语不定式可作介词but和except的宾语。不定式在介词but, except后面时,如果but , except之前有行为动词do的各种形式,那么but, except后的不定式不带to,否则要带to。I have no choice but to go.She could do nothing but cry.The teacher made no comments except to tell him to work hard.4. 作宾语补足语(1) 在表示感觉的动词以及使役动词后作宾语补足语,不定式都不带to。变为被动语态时,原不带to的不定式要变成带to的不
4、定式。这类动词可以表述如下:“一感 (feel)、二听 (hear, listen to )、三让 (let, have, make )、四观看 (see, observe, watch, look at)”。 I often hear him sing the song.Did you see him go out?She made him give up smoking.Let him do whatever he wishes to do.(2) 在表示心理状态的动词后作宾语补足语, 这时不定式通常是“to be +形容词或名词”的结构。这类动词有:consider, think, believe, find, imagine, judge, suppose, prove等。 consider, think, find后的to be常可省略。We consider him (to be) a good teacher.I thought her (to be) nice and honest the first time I met her.5. 作定语不定式作定语通常放在其修饰
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