1. 肯定句：He used to be a teacher.同义句：He was a teacher in the past.否定句：He usedn't to be a teacher. 或：He didn't use to be a teacher.
一般疑问句：Used he to be a teacher? 或：Did he use to be a teacher?肯定回答：Yes, he used. 或：Yes, he did.否定回答：No, he usedn't. 或：No, he didn't.2. 肯定句：I used to get up early.同义句：I got up early in the past.否定句：I usedn't to get up ealry. 或：I didn't use to get up early.一般疑问句：Used you to get up early? 或：Did you use to get up early?肯定回答：Yes, I used. 或：Yes, I did.否定回答：No, I usedn't. 或：No, I didn't.3. 肯定句：They used to live here.同义句：They lived here in the past.否定句：They usedn't to live here. 或：They didn't use to live here.一般疑问句：Used they to live here? 或：Did they use to live here?肯定回答：Yes, they used. 或：Yes, they did.否定回答：No, they usedn't. 或：No, they didn't.