used to
definitions
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describes a past habit or state that is no longer true; indicates something that happened regularly in the pastzh: 描述过去存在的习惯或状态,现在已不再成立;表示过去经常发生的事情
examples
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I used to play tennis every weekend, but now I don't have time.
我过去每个周末都打网球,但现在没时间了。