be about to do 和plan to 有什么区别
plan to do 和plan on doing有什么区别?
be to do be about to do 有什么区别
be about to do和mean to do和intend to do有什么区别
is about to do和will be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 about to 和be to 有什么区别?
be about to do和be about doing 区别
be going to do、be about to do、be to do,这三者有什么区别?
to do 和 to be done 有什么区别?
be able to do和do有什么区别.
be about to 与be to 有什么区别?