一般过去时

主系表

主语I或单数=was

I was her boyferiend before.

 

You或复数=were

You were her girlferiend before.

 

变疑问句:be移动句首

Was you her boyferiend before.

 

变否定句:wasn't,weren't

I wasn't her boyferiend before.

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时间状语(表示过去)

yesterday,just now(刚才),the day before yesterday(前天)

I was her boyferiend just now.

 

in 2015 = 2015年:in 2015 years(x)不需要有year.

I was busy in 2015.

 

last hour:I was busy last hour我上一个小时很忙.

 

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主谓宾:将谓语动词变成过去式

We slept last yesterday.

 

变疑问句:句首加did,谓语动词变原型

Did you work yesterday?

 

否定句:谓语动词加didn't(did not),变原型

I didn't terch English in 2017.