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.

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