be about to do sth… when和while的差别……be about to do sth… when和be about to do sth…while差别是什么?请给出明确的解析!
问题描述：
be about to do sth… when和while的差别……
be about to do sth… when和be about to do sth…while差别是什么?请给出明确的解析!
答
意思上没什么区别，但是while后面必须加ing
答
be about to do sth...when...固定句型“正准备...这时...” 不能用while