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

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,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 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used to造句 用used to造句 用 used to 造句. used to do 造句 used to造句 用 used to 造句 用be used to造句 be used to do造句 用used to be 造句 用used to 造句啦, the son often w____ to his parents. his son goes to a different school___ used to 与 be used to 的区别,并造句 用used to do be used to doing造句 He ( ) (take) his son to theHe ( ) (take) his son to the zoo yesterday.