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is running.
was running.
What are they doing?
They
What were they doing
at ten last night ?
They
are dancing.
were dancing.
What are you doing now?
What were you doing at this time last Sunday
We are having an English class.
We were having a sports meeting.
过去进行时
含义： 表示过去某个时刻正在进行的动作。
结构：
was/were + doing
例句：
I was reading a book at this time yesterday.
现在进行时
含义： 表示现在
正在进行的动作。
结构：
is/am/are + doing
例句：
I am reading a book now.
at this time yesterday
at seven o’clock yesterday morning
at three o’clock yesterday afternoon
at nine yesterday evening