内容正文:
非谓语动词包括动词不定式、动词-ing形式和动词-ed形式。非谓语动词在句中不能单独作谓语,不受主语人称和数的限制。
非谓语动词既有动词性质(比如可以有自己的宾语、状语等),又有非动词性质(不定式相当于名词、形容词和副词等)。
非谓语动词是中考考点之一,主要考查动词不定式和动词-ing形式。
动词不定式
动词不定式可以在句中作主语、宾语、宾语补足语和目的状语等。
动词不定式由“to+动词原形”构成,有时to可以省略。其否定形式为“not+动词不定式”。
e.g. To learn English well is difficult.
动词不定式作主语时,为了保持句子平衡,常用it代替它作形式主语,而将真正的主语—动词不定式后置,上面的例句常写为:It’s difficult to learn English well.
考点一:作主语。
形式主语代替动词不定式的常用句型为:
It’s + adj. + (of / for sb.) to do sth.或
It’s +n. + (for sb.) to do sth.
It takes sb. some time to do sth. 。
e.g. It’s very nice of you to offer me a seat.
It’s very dangerous for children to cross
the busy street.
It was great fun to have a picnic there.
1. It’s necessary for us _______ English
well.
(2018 湖南怀化)
A. to learn B. learning C. learn
2. It often takes me two hours ______ my
homework in the evening.
(2018 广西桂林)
A. do B. doing C. to do
A
C
3. —Could I go swimming with my friend,
dad?
— No, it’s very dangerous fo