since

/sɪns/ prep. / conj. / adv.
标准词条 CET-4
一句话记住

自……以来；从……以后；此后；因为；既然

释义与例句

prep./conj./adv. 自……以来；从……以后；此后
from a particular time in the past until now or until a later time in the past, or after that time
  1. She has worked at the hospital since 2018.
    自2018年以来，她一直在这家医院工作。
  2. I have felt much more confident since I started driving lessons.
    自从开始上驾驶课以来，我自信多了。
展开其余 1 条例句
  1. He moved abroad two years ago and has only visited us once since.
    他两年前移居国外，此后只来看过我们一次。
conj. 因为；既然
because or as, used to give the reason for something, especially a reason already known to the listener
  1. Since the weather was so warm, we ate lunch in the garden.
    由于天气很暖和，我们在花园里吃了午饭。
  2. Since you have finished your work, you may leave early.
    既然你已经完成了工作，可以早点走。
展开其余 1 条例句
  1. We took the bus, since there were no taxis outside the station.
    因为车站外没有出租车，我们改乘了公交车。

词源与构词

记忆钩子 表示时间时，since 接“起点”，for 接“时长”；表示原因时，since 是“既然、由于”，常用于引出自明或已知的原因。

词族与关联词

易混词（形近或义近，注意区别）
  • for 持续……（一段时间）
    since 表示从某个时间起点延续到现在或过去某时，后接时间点或从句，如 since Monday、since I moved；for 表示动作或状态持续多久，后接时间段，如 for a week、for eight years。
    She has worked at the hospital for eight years. 她已经在这家医院工作八年了。
  • because 因为
    since 作原因连词时常引出自明或双方已知的原因，语气比 because 稍弱、稍正式；because 更直接地回答问题为什么。强调关键原因或回答 why 时通常用 because。
    We stayed indoors because the rain was very heavy. 因为雨很大，我们待在室内。
常见搭配
  • since then 从那以后
    They met at a conference five years ago and have worked together since then. 他们五年前在一次会议上相识，从那以后一直合作。
  • ever since 从那以后一直；自从
    She has loved painting ever since she received her first set of brushes. 自从收到第一套画笔以来，她一直热爱绘画。
  • since childhood 从童年起
    He has been afraid of deep water since childhood. 他从童年起就害怕深水。