He used to drink a cup off coffee before going to bed（改成一般疑问句和否定句）

He used to drink a cup off coffee before going to bed（改成一般疑问句和否定句）
He used to drink a cup off coffee before going to bed（改成一般疑问句和否定句）

He used to drink a cup off coffee before going to bed（改成一般疑问句和否定句）
Did he use to drink a cup of coffee before going to bed?
He didn't use to drink a cup of coffee before going to bed.

Did he use to drink a cup off coffee before going to bed? 或者：
Used he to drink a cup off coffee before going to bed?
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