be to do.be going to do.be doing.will do.有什么区别?

be to do.be going to do.be doing.will do.有什么区别? be going to,be doing,will do有什么区别 will be doing,be going to do,will do ,有什么差别?be going to leav be doing与be going to do有什么区别? 区别be going to do/will do/will be doing/be to do be going to do/be doing/will do/be to do等 的区别~ 将来时态的区别be going to;will do;be doing;be to do;be about to do be to do,be going to do,will do,be about to do的区别. will be 和will be doing 和be going to do 三者区别. be doing 和will do 和be going to do 的区别 will \be doing to do \be about to do \be to do的区别 will,be going to do,be doing表将来