to be doing 和to do 有什么区别吗? 不是都表将来时么?

用 be doing 和be doing to do 造句 三个 be devoted to do 和be devoted to doing的区别?呃 有be devoted to do Be said to do和be said to be doing和be said to have done有什么区别 be adequate to do 和 be adequate to doing有什么区别 be going to和will do和be about to do和be to do和be doing都表示将来,有什么区别.怎么用 有没有be fun with,be fun to do和be fun doing这些说法? be sure to do和be sure of doing 的区别be sure to do和be sure of doing的意义有什么不同 used to和be use to 加do还是doing be to do.be going to do.be doing.will do.有什么区别? need doing = need to be 它和need to do有什么区别 pretend to do 和pretend to be doing有什么区别. to be doing 和to do 有什么区别吗? 不是都表将来时么? 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