be to do & be about to do的区别

be to do & be about to do的区别 be to do,be going to do,will do,be about to do的区别. will \be doing to do \be about to do \be to do的区别 be to do be about to do 有什么区别 将来时态的区别be going to;will do;be doing;be to do;be about to do be about to do be going to do、be about to do、be to do,这三者有什么区别? be about to do和be about doing 区别 be sure to do 与be about to do之间的区别 be about to do 和be going to do的区别? 区分词汇cloth,clothes,clothing的区别be going to,be about to do,be t be to do和be going to do的区别