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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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