摘要: 作主语 例如:To learn English well is not easy. 或 It is not easy to learn English well. 动词不定式作主语时.往往用it作形式主语.这种句型可归纳为下面的句型: It is + adj.+ 动词不定式 如果要说明不定式的动作执行者.可以用for It is + adj.+ for sb. to do sth.
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