be to do 和 be doing 做主语the first thing when you go to school is( )the teacher.a.greeting b.to greet c.greet d.greeted选哪一个?

用 be doing 和be doing to do 造句 三个 be afraid of doing 和 be afraid to do 区别 be easy to do和 be easy doing 的区别 be about to do和be about doing 区别 be allowed to do和be allowed doing 什么区别 be to do和be doing的区别 be gonging to do和be doing的区别 be careful doing和be careful to do的区别? be left doing和be left to do怎么区别 used to和be use to 加do还是doing used to do,be used to doing和 be used to do的区别,并举例说明 be made to be doing 和be made to do的区别 be going to do和be doing和want to do 三者之间的区别 Be said to do和be said to be doing和be said to have done有什么区别 英语 have trouble+?be use to do 和 be use to doing区英语have trouble+?be use to do 和 be use to doing区别 be used to do 和doing区别RT be seen to do和doing有神魔区别 有没有be fun with,be fun to do和be fun doing这些说法?