精选优质文档-倾情为你奉上动词不定式和动名词作主语一,作主语 不定式作主语 动词不定式作主语时,句子的谓语动词常用单数,其位置有以下两种: (1)把不定式置于句首, 不定式作主语侧重于将来特定的某一次, 如: To get there by bike will take us half an hour. (2)用it作形式主语,把真正的主语不定式置于句后,常用于下列句式中.如: It+be+名词+to do Its our duty to take good care of the old. It takes sb + some time +to do How long did it take you to finish the work It+be+形容词+for sb +to do It is difficult for us to finish writing the composition in a quarter of an hour. It+be+形容词+of sb +to do It is s
