1. 引导时间状语从句,意为在------期间,当----时候,相当于when,从句中一般用延续性动词或表示状态的结构。例如:
The little boy fell asleep while the teacher was giving the lesson.
老师上课的时候,这个小孩睡着了。
2. 引导时间状语从句,意为与----同时,从句中也一般用延续性动词或表示状态的结构。例如:
While the students were busy reading and writing ,the teacher went to the office to get a book.学生在不停的读和写时,老师到办公室去拿书。