2. 动词不定式具有名词、形容词和副词的 特征,因此可在句子中作主语,宾语,宾语补足语,定语和状语等。
a)动词不定式常用来做主语:
To do morning exercises is good for health.
作早操对身体有意。(这里的谓语动词应用is )
但在很多情况下,特别是在口语中,我们常用it 来代替它作主语,而把它移到句子后半部分,这样式句子显得比较平稳。
It took me one and a half hours to finish my homework.
完成家庭作业用了我一个半小时。
b)常见的作宾语的动词不定式短语有:
begin to do (开始做); decide to do (决定做)
forget to do (忘记做); hope to do (希望做)
learn to do (学做) ; like to do (喜欢做)
love to do (喜爱做); prefer to do (宁愿做)
start to do (开始做); want to do (想要做)
wish to do (希望做); remember to do (记得做)
would like to do (想要做); try to do (努力做)
agree to do (同意做)等。
c)做宾语补足语的动词不定式短语有:
ask sb to do 请某人作; tell sb to do叫某人作 ; want sb to do想要某人作 ; would like sb to do想要某人作 (较前更委婉) ; prefer sb to do 宁愿某人作; like sb to do喜欢某人作; teach sb to do教某人作 ; help sb to do 帮助某人作;etc.
与make, let, see, hear, watch等词构成的短语中,动词不定时不带 to .
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