I was very busy last Sunday .
I was not very busy last Sunday .
Was I very busy last Sunday.
Yes,I was. No i wasn't
They were very busy last summer.
They were not very busy last summer.
Were they very busy last summer?
Yes, they were. No, they weren't
It was my father's birthday that day.
It wasn't my father's birthday that day.
Was it my father's birthday that day?
Yes, it was. No, it wasn't.
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