be able to do和do有什么区别.
be able to do和do有什么区别.
be unable to do与be not able to do有什么区别
be about to do和mean to do和intend to do有什么区别
be able to do sth 等于什么
be to do be about to do 有什么区别
to do 和 to be done 有什么区别?
be to do和be about to do有什么区别?
be to do sth.和be about to do sth.有什么区别?
be consided to do sth 和be supposed to do sth 有什么区别
be planned to do 和be intended to do 有什么区别?
is about to do和will be有什么区别?
be able to do sth