动词不定式的基本用法归纳动词不定式的基本用法归纳v 一、动词不定时的形式:v 肯定式:to do sth 否定式:not to do sth. v 被动式:to be done 完成式:to have done v 二、动词不定式的用法 v 1作主语v A 动词不定式作主语,谓语动词用单数形式。如:v (1) To see is to believe.v (2)To master English gives us much help in the study of sience.v B 不定式或不定式短语作主语时,常用it作形式主语,构成“It is + 形容词(+for sb.)不定式”结构。v It is impossible for him to give up smoking. 2. 作宾语v A动词后直接不定式作宾语的动词有许多,如want, decide, intend, fail, wish, export, pretend, choose等等。v I mean to go there at once.v B.不定式短语作宾语时,如果还带有宾语补足语,往往把不定式短语放在