Its time to do sth.和 Its time doing sth.有什么区别?

Its time to do sth.和 Its time doing sth.有什么区别? spend time in doing sth 和spend time to do sth有什么区别? It's time to do sth.和 It's time doing sth.有什么区别? doing sth和to do sth 有什么区别 it's a time to do sth 和it's time to do sth 有什么区别 be happy to do sth和have a good time doing sth的区别 hear sb do sth和doing sth有什么区别有to do sth吗 It is time to do sth和It is time for sth有区别吗? waste time to do sth还是waste time doing sth? its polite to do sth take one's time to do sth 与take one's time doing sth 的区别 have time to do sth.与 have time doing sth.的区别