四六级

　　有很多考生认为英语语法只有在高中有用，大学英语四级考试拼的是词汇量，其实不是这样的，在大学英语四级考试中，英语语法知识也是很重要的，比如说常见的时态语态，这些考生都要会用，会看。文都小编为大家整理了相关的语法信息，供大家学习。

　　现在分词的被动式可以用来作定语, 宾语补足语, 状语及用于独立结构中.

　　This is one of the experiments being carried on in our laboratory.

　　You’ll find the topic being discussed everywhere.

　　Being asked to give a performance, she couldn’t very well refuse.

　　These are sold at reduced prices, the defects always being pointed out to the customers.

　　完成被动式: 如果表示的动作在谓语表示的动作之前发生, 有时需要用动名词的完成被动式.

　　I don’t remember having ever been given a chance to try this method.

　　但在多数情况下都避免使用这一形式, 而用一般被动形式代替, 以免句子显得累赘.

　　现在分词的完成被动式一般用来作状语或用于独立结构中.

　　Having been given such a good chance, how could she let it slip away?

　　The decision having been made, the next problem was how to make a good plan.

　　All the compositions having been written and collected, the teacher sent the students home.

　　句法功用

　　作主语:

　　Walking is good exercise.

　　It’s nice talking to you.

　　There is no denying the fact that the new method has greatly raised labour productivity.

　　作宾语:

　　Your shoes need polishing.

　　You mustn’t delay sending the tractors over.

　　He avoided giving us a definite answer.

　　作介词宾语: 动名词作介词宾语用的时候最多. 它常可以用在某些成语后面, 常见的有: insist on, persist in, think of, dream of, object to, suspect…of, accuse…of, charge…with, hear of, approve of, prevent…from, keep…from, stop…from, refrain from, be engaged in, look forward to, opposed to, depend on, thank…for, feel like, excuse…for, aim at, devote…to, set about, spend…in, get (be) used to, be fond of, be capable of, be afraid of, be tired of, be sick of, succeed in, be interested in, feel (be) ashamed of, be proud of, be keen on, be responsible for.

　　作表语:

　　The real problem is getting to know the needs of the people.

　　动名词和不定式都可以作主语或表语. 一般说来, 在表示抽象的一般的行为时多用动名词; 在表示具体某词动作, 特别是将来的动作时, 多用不定式.

　　作宾语补足语: 分词可以在see, hear, notice, watch, feel, find, keep, get, have等动词后作宾语补足语.

　　The words immediately set us all laughing.

　　Once we caught him dozing off in class.

　　His remark left me wondering what he was driving at.

　　在see, hear, feel, watch, notice等动词后, 及可用现在分词, 也可用不定式构成宾语补足语. 用现在分词时, 表示动作正在发生, 用不定式时表示动作发生了.

　　Do you hear someone knocking at the door?

　　Yes, I did. I heard him knock three times.

　　作状语: 现在分词作状语时, 通常都表示主语正在进行的另一动作, 来对谓语表示的主要动作加以修饰或作为陪衬.

　　I ran out of the house shouting.

　　I got home, feeling very tired.

　　Driving to Chicago that night, I was struck by a sudden thought.

　　现在分词短语有时可以用作状语表示原因, 相当于一个表示原因的状语从句.

　　Not knowing her address, we couldn’t get in touch with her.

　　Seeing nobody at home, she decided to leave them a note.

　　Having already seen the film twice, she didn’t want to go to the cinema.