/ˈju:st tə;before a vowel and in final position ˈju:st tu: ||; ˈjust tə; ˈjust tu/modal verb for talking about sth that happened often or continuously in the past or about a situation which existed in the past （用于指过去经常或持续发生的事，或指过去存在的情况）: She used to live with her parents (= but she doesn't now). 她以前和父母同住。You used to live in Glasgow, didn't you? 你以前在格拉斯哥居住，对吗？Did you use to smoke? 你以前吸烟吗？He didn't use to speak to me. 他过去从不跟我说话。 We usually use did to form negatives and questions with use to I didn't use to like jazz. Did she use to be in your class? Be careful not to confuse used to + infinitive, which only refers to the past, with be used to (doing) sth, which can refer to the past, present or future. Compare I used to live on my own (= but now I don't). I'm used to living on my own (= I am accustomed to it). use to用于否定句和疑问句时通常要用did：I didn't use to like jazz.我过去不喜欢爵士乐。·Did she use to be in your class?她以前在你班上吗？小心不要混淆used to+不定式和be used to (doing) sth，前者只指过去的事，后者可指过去、现在或将来的事。比较：I used to live on my own.我以前是一个人住的。·I'm used to living on my own.我习惯一个人住。