used to作一般疑问句时,回答怎么回答?肯定和否定形式.

问题描述:

used to作一般疑问句时,回答怎么回答?
肯定和否定形式.

英:
Used he to be shy?
—Yes,he used to.
—No,he usedn't.
美:
Did he use to be shy?
—Yse,he did.
—No,he didn't.