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熱點語法聚焦

1. 非謂語動詞的完成式having done的用法

非謂語動詞的完成式having done表示在謂語動詞所表示的動作之前發(fā)生的動作。其否定式為not having done。如:

Having been criticized by the teacher, he gave up smoking.

Not having studied his lessons very hard, he failed the examinations.

分詞的被動式表示它的邏輯主語是-ing分詞動作的承受者。根據(jù)-ing分詞動作發(fā)生的時間,-ing分詞的被動式有一般被動式(being done)和完成被動式(having been done)。如:

He never talked about his having been interviewed by the reporter.

The question being discussed is very important.

2. 非謂語動詞的-ing形式和to do形式的區(qū)別

有些動詞既能接不定式,又能接-ing形式,含義有所不同。如:

(1) forget, remember, regret等詞后面接不定式表示不定式動作后于謂語動作,而后接-ing形式作賓語表示動名詞動作先于謂語動作。如:

Do you remember seeing me before? 你記得以前見過我嗎?

Remember to lock the door when you leave. 離開時要記得鎖門。

(2) 動詞mean, stop, try, go on等動詞后面接動名詞和接不定式作賓語,意思也有所不同。如:

I mean to change it for another one. 我想換成另外一個。

Missing the train means waiting for another hour.

誤了這班車就意味著再等一個小時。

(3) 動詞allow, advise, forbid, permit等可直接跟-ing形式作賓語,不可以接動詞不定式作賓語,但可接不定式作賓語補足語。如:

Please permit me to say a few words.請允許我說幾句話。

We don’t permit smoking here. 我們這兒不允許吸煙。

(4) 動詞need, require, want作"需要"解時,后面接-ing分詞或不定式被動式。如:

These little children require looking after carefully / to be looked after carefully.

這些小孩需要細(xì)心地照料。

(5) 動詞like, hate, prefer等后面,如表示一般性動作,多用-ing形式;如指特定的具體的某次動作,多用不定式。如:

I like swimming, but I don’t like to swim with you.

我喜歡游泳,但我不喜歡和你一起游泳。

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