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at 8:00 last night
He was doing the homework
in the house.
in the house
at the time of the rainstorm
What was the girl doing at the time of the rainstorm?
She was reading in the library.
in the library
when the rainstorm came
What were you doing when the rainstorm came?
We were dancing at
home.
at home
Grammar Focus
What was he doing when the rainstorm came?
He was reading in the library when the rainstorm came.
What was Ben doing when it began to rain heavily?
While Ben was helping his mom make dinner,it began to rain.
What was Jenny doing while Linda was sleeping?
While Linda was sleeping, Jenny was helping Mary with her homework.
when 和 while 的异同
when: at or during the time(时间点或一段时间)
while: during the time(一段时间)
1）主句用过去进行式+when引导的从句用一般过去式
2）主句用一般过去时+while引导的从句用过去进行时
3）主句用过去进行时+while引导的从句用过去进行时
观察when和while后的动词
1) when后的动词可以是_______也可是_______
2）while后的动词具有________
延续性