英语动名词语态时态 主动 形式 被动 形式一般式完成式(not) doing (not) being done(not)having done(not)having been done动名词 的用法： 1.作主语 Swimming is good for health. Raising your hat to a lady is good manners . 对一位女士脱帽致敬是礼貌的。 Being killed by sharks in the sea is a common thing . 动名词作主语时，还可以用it作形式主语： It is no good waiting here. It is no use crying over spilt milk. 覆水难收。 It is a waste of time talking to him . 注意 动名词和不定式都可以作主语，动名词作主语表示一般或抽象的多次性行为，不定式作主语往往表示具体的或一次性的动作。如： Playing with fire is dangerous. （泛指玩火） To play with fire w
