Grammar: 动词不定式
Ⅰ. 不定式句法功能
1. 作主语:The cat said, To take roller coaster is terrible.
不定式短语作主语时,可以直接放在句首,但在很多情况下,尤其是在疑问句和感叹句中,往往放在谓语之后,而用先行代词it作形式主语。
The cat said, Its terrible to take roller coaster.
How long did it take you to take roller coaster?
How terrible it is to take roller coaster?
不定式作主语常见句型:
a) It is + adj. (easy, important, difficult) + 不定式
b) It is + n. (a pity, a pleasure, ones duty, a shame) + 不定式
eg. Its my duty to teach you how to be a student of No.3 Middle School.
c) It takes/needs/requires + some time (hours, months, days, patience) + 不定式
eg. It requires patience to be a good teacher.
2. 作表语:当句子的主语是aim, idea, policy, question, suggestion, wish, task, duty, job, purpose等或者主语是what引导的名词性从句时,后面可以用不定式做表语,用以说明主语所包含内容。
eg. Our most important task now is to make a plan.
注:作表语的不定式都带to,但当主语部分有实义动词do时,to可以省略。
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2016-02-29
2016-02-29
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