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动词不定式做表语

不定式作表语表示具体动作或将来动作;动名词作表语表示抽象的一般行为。

①To be kind to the enemy is to be cruel to the people.

②My chief purpose is to point out the difficulties of the matter.

③What I would suggest is to put off the meeting.

当主语和表语都是不定式时，其含义一是条件，一是结果(例①)。当主语是aim,duty,hope,idea,mista ke,plan,purpose,suggestion等为中心词的名词词组(例②)时，或以what引导的名词性分句(例③)，不定 式说明主语的内容。

④Our work is serving the people.

⑤What he likes is taking a walk after supper.

⑥The story told by Mr.Wang is interesting.

④⑤句动名词作表语，与主语部分可以转换，如Serving thepeople is our work,而⑥句中是现在分词作表语，说明主语的性质、状态，现在分词具有形容词的各种特征，另外，动名词作表语还应与进行时态区别开来。