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否定句:主语+am/is/are+not+doing+其他
表示现在正在进行的动作,也可表示现阶段正在进行的动作。
表示过去某个时刻正在进行的动作,也可表示过去某阶段正在进行的动作。
then, at that time, at this time yesterday/last night, at+时间点+yesterday/ last night,
when/ while引导的时间状语从句
肯定句:主语+was/were+doing+其他
一般疑问句:was/were+主语+doing+其他
否定句:主语+was/were+not+doing+其他
Lucy was taking the singing lesson at this time yesterday.
I was doing my homework at the time of the earthquake.
We were watching TV when it was still sunny yesterday afternoon.
While I was reading a book, my mom was cooking the dinner.
例句示范
What are they doing now?
They were having dinner at seven last night.
at seven last night?
were
at seven last night?
Look! What is the boy doing ?
when it started to rain?
was
when it started to rain?
He was running when it started to rain.
What is the girl doing right now?
at that time
was
at that time?
She was playing basketball at that time.
doing my homework / studying
b. playing basketball / reading