“动词不定式做主语”和“动名词做主语”有什么区别?答:常用动词不定式做主语的句型有:It is difficult (important, necessary) for sb. to do sth. It is kind (good, friendly, polite, careless, rude, cruel, clever, foolish, brave) of sb. to do sth.常用动名词做主语的句型有:It’s no good (use, fun) doing sth. It’s (a) ...