英语中动词不定式做主语和动名词做主语如何区分?答:2、常用不定式做主语的句型有:(1)It’s difficult (important, necessary) for sb. to do (2)It’s kind (good, friendly, polite, careless, rude, cruel, clever, foolish, brave) of sb. to do.3、常用动名词做主语的句型有:It’s no good (use, fun) doing.It’s (a) waste...