动词不定式做主语有哪几种形式答:动词不定式作主语的常用句型有:1. It is+adj./ n. (+for sb./sth.) + to do sth.用于此句型的形容词有:easy, hard, difficult, possible, important, impossible, necessary, good, bad, exciting, interesting, surprising等.例如:It is interesting to play this game.It is necessary...