您看我给的两个图
第二个图的两个例子,就是It做形式主语
真正的主语也是句子,也可以认为,这两个例子是“主语从句”吧?
可以吗?
追答不是哦,因为getting everything ready in time 和leaving today's work for tomorrow这两个短语并不是句子哦,所以不能称之为主语从句~
它们之间的区别主要在于作主语的结构不同,一个是句子作主语,一个是短语作主语:
一、主语从句作主语,主语从句是一个句子,一个有主谓结构的句子,注意观察,就用你图中的句子为例:
1 It is important that we study a foreign language.(that we study a foreign language这部分是主语从句,是一个句子,其中we是主语,study是谓语动词)
= That we study a foreign language is important.
2 It is necessary that he act at once.(that he act at once是主语从句,其中,he是主语,act是谓语动词)
= That he act at once is necessary.
二、主语很长(动词-ing短语/动词不定式短语/……)作的主语,是短语,不是句子。
1 It will be difficult getting everything ready in time. (getting everything ready in time这部分是主语,是动词-ing短语)
= Getting everything ready in time will be difficult.
2 It is no good learning today's work for tomorrow. ( learning today's work for tomorrow这部分是主语,也是动词-ing短语)
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