it 后面动词是do sth.还是to do sth.

must 后面是加to do sth.还是do sth. must 后面是加do sth.还是 to do sth. why not后面是doing sth还是 to do sth 怎样分清动词后面是跟doing sth、to do sth、do sth? It's fun 后面是跟doing sth.还是跟to do sth. wish to do sth的do是名词还是动词 what you can do is...后面是to do sth还是do sth?另外doing sth行吗 would like to do sth加上and,后面加to do sth还是do sth啊 是may to do sth,还是may do sth?do not smoke too much.It（ )cance have problem 后面的动词是v.ing 还是to do sth 请问是It upset sb to do sth还是It upsets sb to do sth? 是it is time to do sth还是 it is the time to do sth