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1、非谓语动词用法详解 动词的非谓语形式有三种：不定式、动名词和分词（一）不定式不定式由“ to十动词原形构成，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 逻辑主语有时用“ for 十名词或代词宾格构成.1.不定式的用法：1）作主语.不定式短语作主语时，往往放在谓语之后，用it作形式主语.例 如：To see is to be1ieve.It is right to give up smoking.2）作宾语.不定式短语作宾语时，如果还带有宾语补足语。往往
2、把不定式宾 语放在宾语补足语之后，而用 it 作形式宾语.例如：He wanted to go.I find it interesting to study work with him.3）作宾语补足语.例如：He asked me to do the work with him.注意 ：在 fee1， hear， 1isten to， 1ook 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 时，就必须带to.例如I often hear him sing the song.He i
3、s often heard to sing the song.注意：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.如：She could do nothing but cry.What do you like to do besides swim?I have no choice but to go.动词 help 之后，带 to 或不带 to 都可以。Will you please help me （to） take this suitcase? 请你帮我提一下这个衣箱好吗？
4、She often helps her mother （to） clean their house. 她经常帮助她妈妈打扫房子。4）作定语.例如：I have some books for you to read.注作定语的不定式如果是不及物动词，或者不定式所修饰的名词或代词是不 定式动作的地点、工具等，不定式后面须有相应的介词.例如：He is looking for a room to live in.There is nothing to worry about.Please give me a knife to cut with但是，不定式所修饰的名词如果是time, place或wa
5、y，不定式后面的介 词习惯上要省去例如：He had no money and no place to live.注当作定语的不定式所修饰的名词或代词是不定式动作的承受者时，不 定式既可以用主动语态，也可用被动语态，但其含义有所不同试比较：A）Have you anything to send?你有什么东西要寄吗?（不定式 to send 的动作执行者是 you）B）Have you anything to be sent?你有什么要（我或别人）寄的东西吗?（不定式 to be sent 的动作执行者是已被省略的 me 或 someone else）5）作状语，表示目的、原因、结果或条件例如：
6、I came here to see you.（目的）We were very excited to hear the news.（原因） He hurried to the school to find nobody there. （结果）so + adj. / adv. + as to dosuch + adj. + n. +as to doadj. / adv.+ enough + to dotoo + adv. / adj. +to do:太而不能非常He was so foolish as to believe it.= He was such a fool as to believ
7、e it.= He was foolish enough to believe it.The ice is too thin to skate on.=The ice is not thick enough to skate on.He was too happy（情感 adj.） to see his father. You can never too careful to cross the road.再都不为过To look at him, you would like him. （条件） 目的状语还可以用 in order to 或 so as to 来表示.如：In order to
8、 pass the exam, he worked very hard.We ran all the wayso as not to be late.不定式也可在作表语用的形容词后面作状语.例如：I am very glad to hear it.The question is difficult to answer.“ too 十形容词或副词十不定式”作状语.例如：He is too old to do that.另外句子中有 enough 这个词时，常用不定式作状语.例如 The room is big enough to hold us.6）作表语例如：My job is to help
9、 the patient7）作独立成分例如：To tell the truth， I dont agree with you. 8）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、表语、宾语，宾补等例如：He didn t know what to say.（宾语）How to solve the problem is very important.（主语） My question is when to start. （表语）She often teaches me how to read and write.（作宾语补足语）
10、她常教我 如何读书写字。注意：在与 why 连用时，只用于 why 或 why not 开头的简短疑问句中，后 面紧跟的动词不定式不带 to. 例如:Why not have a rest?9）不定式在句中用主动式还是被动式。多数情况下是容易判别的，但有时 的确比较复杂，请注意以下几点：A）不定式修饰的名词或代词和不定式构成逻辑上的主谓关系时,不定式 往往用主动形式.Have you got a key to unlock the door? （A key unlocks the door. ）B）不定式和它前面被修饰的名词或代词构成逻辑上的动宾关系，又和该 句主语构成逻辑上的主谓关系时,不定
11、式常用主动形式.I have got a letter to write. （ I write letter. ） He needs a room to live in. （ He lives in a room. ）I know what to do. （ I do what. ） 但这句如改为下列形式,不定 式就得用被动形式：I know what is to be done.这是因为 what is to be done 是宾语从句,从句中的主语 what 是动词 do 的动作对象C）不定式作表语形容词的状语，和句中主语构成逻辑上的动宾关系时， 不定式多用主动形式,这是因为人们往往认为形
12、容词后省去了 for one 或 for people .例如：He is hard to talk to. （ to talk to him. ）The book is difficult to understand. （ to understand the book.） 但如果强调句中的受事者时，亦可用不定式被动式，例如：The handwriting is very difficult to be read.（是隐形主语，非显性主语） The box is too heavy to be lifted.D）在“there十be的结构中，当说话人考虑的是必须有人去完成某 件事时，不定式用主
13、动形式，如果说话人强调的是事情本身必须完成，则用被动 形式.There is a lot of work to do. ( Somebody has to do the work. )There is a lot of work to be done.( The work has to be done.) 请注意下面两个句子的含义是不同的： There is nothing to do. 意为无事可做，感到十分乏味 There is nothing to be done .意为某东西坏了，无法使之恢复正常.2不定式的时态1）不定式的一般形式所表示的动作，通常与谓语的动作（状态）同时（或几乎 同
14、时）发生，或是在它之后发生.例如：I saw him go out.2）如果谓语表示的动作（情况）发生时，不定式表示的动作正在进行，这时不 定式就要用进行式.例如：I am very g1ad to be working with you.3）如果不定式的动作发生在谓语动词之前，就要用完成式.例如:Im sorry to have kept you waiting.3.不定式的语态 当不定式逻辑上的主语是这个不定式所表示的动作的承受者时，不定式一 般要用被动形式。例如：He asked to be sent to work in the countryside.It is possib1e f
15、or our hopes to be rea1ized.（二）动名词1. 动名词由动词+ ing构成;具有动词和名词的性质;在句中起名词作用， 可作主语、宾语、表语和定语.1）作主语.例如:Seeing is be1ieving.Laying eggs is the ant queens full- time job.It is no use arguing with him.注意：动名词和不定式都可以作主语，动名词作主语表示一般或抽象的 多次性行为，不定式作主语往往表示具体的或一次性的动作.例如：P1aying with fire is dangerous. （泛指玩火）To p1ay with fire wi11 be dangerous. （指一具体动作）但在 It is no use good， not any use good， use1ess 等后必需用动名词。2）作表语.例如：Her job is teaching.3）作宾语.例如：He is fond of p1aying footba11.I 1ike swimming.注 admit， appreciate， avoid， consider, de1ay, dis1ike， enjoy， escap
