be going to,be about to,be doing 的区别

be going to,be about to,be doing 的区别 区别be going to,be about to,be doing,be to 将来时态的区别be going to;will do;be doing;be to do;be about to do be about to,be to,be going to,be able to的区别 be going to do 和be doing用法的区别? be doing和be going to do的区别 be doing和be going to的区别和用法! will,be going to,be doing用于一般将来时的区别 be doing be is going to will用法的区别 be going to do和be doing的区别,急, will \be doing to do \be about to do \be to do的区别 be to do,be going to do,will do,be about to do的区别.