用used to 造句,his son is naughty答案是Really?He used to be good为什么要加be啊?请高手谈谈

用used to 造句,his son is naughty答案是Really?He used to be good为什么要加be啊?请高手谈谈 试着用used to造句his son is naughty?为什么答案是Really?he used to be good而不是he used to be quiet 用used to造句 用used to造句 用 used to 造句. 用 used to 造句 用be used to造句 用used to be 造句 用used to 造句啦, 用used to do be used to doing造句 句型转换His son used to be shy.(改为否定句)His son ___ ___ to be shy.The two boys used to (play computer games).(对括号内提问)___ ___ the two boys use to ___? 用be used to（习惯于）造句 用used to do sth造句 用Used to造句 并做肯否回答 用be used to do sth 造句 请用used to 的句式造句 用I used to want造句 用used to but的句型造句