I was doing

过去进行时:过去正在发生的事情

我昨天晚上11.00正在睡觉

1>

I was sleeping at 11.00 last night

he was sleeping at 11.00 last night

you were sleeping at 11.00 last night

2>迁移

I was going to being  at the weekend

he was bying  a car  back home at 9.00 last night

you were learning English 

3>迁移

was he bying a car back home ?

were you learning English?

4>自发迁移

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