be about to,be to,be going to,be able to的区别

be about to,be to,be going to,be able to的区别 be going to,be about to,be doing 的区别 would be able to和be able to的区别 be able to 和will be able to 的区别 be to do,be going to do,will do,be about to do的区别. [英语]be about to ,be going to ,be to 的区别是什么? 请指教be to.be going to.be about to.will的区别?` be going to和be to和be about to的区别 be going to 与be about to 区别 区别be going to,be about to,be doing,be to 区分词汇cloth,clothes,clothing的区别be going to,be about to do,be t be to和be about to区别