Betty’s grandmother was cooking at that time 变为一般疑问句,并做肯定回答.

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Betty’s grandmother was cooking at that time 变为一般疑问句,并做肯定回答.
Betty’s grandmother was cooking at that time 变为一般疑问句,并做肯定回答.

Betty’s grandmother was cooking at that time 变为一般疑问句,并做肯定回答.
was Betty’s grandmothercooking at that time ?
YES she was.

Was Betty's grandmother cooking at that time?
Yes,she was.

What was Betty’s grandmother doing at that time ?
She was cooking.

was Betty's grandmother cooking at that time ?
yes,she was