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since

preposition
 
🔊/sɪns/
🔊/sɪns/
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  1.  
     (used with the present perfect or past perfect tense与现在完成时或过去完成时连用) from a time in the past until a later past time, or until now自…以后；从…以来
    • She's been off work since Tuesday.星期二以来她一直没上班。🔊🔊
    • We've lived here since 2006.从 2006 年开始我们便住在这里。🔊🔊
    • I haven't eaten since breakfast.早饭以后我还没吃过东西呢。🔊🔊
    • He's been working in a bank since leaving school.他中学毕业以后一直在一家银行工作。🔊🔊
    • Since the party she had only spoken to him once.那次聚会以后，她只和他说过一次话。🔊🔊
    • ‘They've split up.’ ‘Since when?’“他们分手了。” “什么时候的事儿？”🔊🔊
    • That was years ago. I've changed jobs since then.那是多年以前的事了。自那以来我已经换过几个工作了。🔊🔊
    Use for, not since, with a period of time: I've been learning English for five years. • I’ve been learning English since five years. Topics Timea2
  2. since when? used when you are showing that you are angry about something（表示气愤）何曾，什么时候
    • Since when did he ever listen to me?他什么时候听过我的话？🔊🔊
    3. Word Originlate Middle English: contraction of obsolete sithence, or from dialect sin (both from dialect sithen ‘thereupon, afterwards, ever since’).

since

conjunction
 
🔊/sɪns/
🔊/sɪns/
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  1.  
     (used with the present perfect, past perfect or simple present tense in the main clause与用现在完成时、过去完成时或一般现在时的主句连用) from an event in the past until a later past event, or until now从…以后；自…以来
    • Cath hasn't phoned since she went to Berlin.卡思自从去了柏林还没有打来过电话。🔊🔊
    • It was the first time I'd had visitors since I'd moved to London.那是我搬到伦敦以后第一次有人来看我。🔊🔊
    • It's twenty years since I've seen her.我已经二十年没见她了。🔊🔊
    • How long is it since we last went to the theatre?我们多久没去看戏了？🔊🔊
    • She had been worrying ever since the letter arrived.自从接到那封信后她就一直焦虑不安。🔊🔊
    Topics Timea2
  2.  
     because; as因为；由于；既然
    • We thought that, since we were in the area, we'd stop by and see them.我们想，既然到了这个地方，就该顺便去看看他们。🔊🔊
    3. Word Originlate Middle English: contraction of obsolete sithence, or from dialect sin (both from dialect sithen ‘thereupon, afterwards, ever since’).

since

adverb
 
🔊/sɪns/
🔊/sɪns/
used with the present perfect or past perfect tense与现在完成时或过去完成时连用
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  1.  
     from a time in the past until a later past time, or until now自…以后；从…以来
    • She went for a run on Monday and has not been seen since. 她星期一去跑步了，此后再也没有见到过。
    • She moved to Pakistan in 1997 and has been living in Lahore ever since.她于1997年移居巴基斯坦，此后一直住在拉合尔。
    • He left home two weeks ago and we haven't heard from him since.他两周前离家外出，我们至今还没有他的音信。🔊🔊
    • The health of the British people was better at the end of the Second World War than at any time before or since.第二次世界大战结束时，英国人民的身体状况好于之前或之后的任何时候。
    • The original building has long since (= long before now) been demolished.原来的建筑老早就拆了。🔊🔊
  2.  
     at a time after a particular time in the past此后；后来
    • The song topped the charts in 1957 and has since become a rock and roll classic.这首歌在1957年荣登排行榜榜首，并成为摇滚经典。
    • We were divorced two years ago and she has since remarried.我们两年前离了婚，之后她又再婚了。🔊🔊
    3. Word Originlate Middle English: contraction of obsolete sithence, or from dialect sin (both from dialect sithen ‘thereupon, afterwards, ever since’).