its　better　do　stn还是its　bettere　to　do　sth

its polite to do sth Its time to do sth.和 Its time doing sth.有什么区别? had better +do sth 还是had better +to do sth using sth to do stn = be used to ding stn 有have time to do sth. have money to do stn. have no money to have...to do stn和have...doing stn的区别 提问句型 是You'd better do sth还是You'd better to do sth 是You would better to do sth还是you would better do sth 最好不做某事是had better not do sth 还是had better not to do sth ．…think／find + it + adj.+ to do sth.中的it可否用its代替 是had better do sth还是have better do sth It's better to do sth rather than后接 do还是 doing还是 to do