used to do sth中used 是什么词翻译成什么，是过去式吗，还是原形

used to do sth. used to do sth used to do sth. 意思 be used to do sth. used to do sth和be used to doing sth中的used是什么词性?used to do sth和be used to doing sth中的used是什么词性? used to do sth中used 是什么词翻译成什么，是过去式吗，还是原形 used to do sth.造句 配中英文 用used to do sth造句 USED TO DO STH.能不能配WHEN 用be used to do sth 造句 be used to do sth造句 used sb.to do sth.的回答 used to do sth 的否定式 used sb to do sth 怎么回答 翻译成英文：used to do sth be used to do sth.used to do sth.be used to dong sth.之间有什么区别? Be used to doing sth,used to do sth ,be used to do sth 有什么区别 用be used to do sth造句用be used to do sth造2句话!