非谓语动词的定义,用法,要例句!必须全面的回答答:Ⅲ、动名词用于“It is no use (good) doing…”等句型 动名词作主语时,也可以用it做先行主语。动名词(短语)常在以 no use, no good, senseless, dangerous, difficult, a waste, a nuisance, useless, hard work, sad thing, a waste of time, worthwhile等词语作表语的句中。 For example: It is a...