be about to do 短语中about做什么成分?be about to do里面about做什么词性?about不是只可以做介词和副词么?但在短语中about做表语,介词可以作表语么?

be about to do 短语中about做什么成分?be about to do里面about做什么词性?about不是只可以做介词和副词么?但在短语中about做表语,介词可以作表语么? be about to do when的同义短语 问几个英语短语的区别be about to do be going to dobe to do这三个的区别 be adj. to do 短语 10个 be to do be about to do 有什么区别 be to do & be about to do的区别 be about to do 句式中 about这个词在句中做什么成分? be about to do和be about doing 区别 be to do,be going to do,will do,be about to do的区别. be about to do sth的用法 be about to do用法,例句 be about to do怎么用 用be about to do做句子 be anxious about /to do sth. will e doing to do e about to do e to do的区别 英语中表示将来时的用法意义有什么不同?be going to do/be about to do/will do/will going to do 系动词短语有 be to do和be going to be to do是情态动词短语吗 be going to,be to do,be about to do 有什么区别