since
- prep.自从;自…以后，从…以来;（表示气愤）何曾，什么时候
- conj.因为，由于;从…以后，自…以来;既然
- adv.自…以后，从…以来;之前，以前;此后，后来
sinceprep.
自…以后；从…以来
from a time in the past until a later past time, or until now
She's been off work since Tuesday.
星期二以来她一直没上班。
We've lived here since 1994.
自1994年以来我们一直住在这里。
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。
I've been learning English for five years.
（表示气愤）何曾，什么时候
used when you are showing that you are angry about sth
Since when did he ever listen to me?
他什么时候听过我的话？
conj.
从…以后；自…以来
from an event in the past until a later past event, or until now
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。
因为；由于；既然
because; as
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。
adv.
自…以后；从…以来
from a time in the past until a later past time, or until now
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 original building has long since (= long before now) been demolished.
原来的建筑老早就拆了。
此后；后来
at a time after a particular time in the past
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。
since
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1
PREP (表示某情况自过去某时间点或某个事件以来一直持续到现在)自…以后，从…以来
You use since when you are mentioning a time or event in the past and indicating that a situation has continued from then until now.Jacques Arnold has been a member of parliament since 1987...
雅克·阿诺德自 1987 年以来一直是议会议员。
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2
PREP (表示某事件或情况从过去某时间或某个事件之后一直发生)自…以来,在…之后
You use since to mention a time or event in the past when you are describing an event or situation that has happened after that time.The percentage increase in reported crime in England and Wales this year is the highest since the war...
今年英格兰和威尔士报道的犯罪增长率是战后以来最高的。
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3
ADV (表示过去某事或某情况发生后不久又发生了另一件事)此后，后来
When you are talking about an event or situation in the past, you use since to indicate that another event happened at some point later in time.About six thousand people were arrested, several hundred of whom have since been released...
约 6,000 人被捕，后来其中的几百人又被释放了。
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4
PHRASE 早就
If you say that something has long since happened, you mean that it happened a long time ago.Even though her parents have long since died, she still talks about them in the present tense.
尽管双亲早已离世，她谈论起他们时好像他们至今健在。
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5
CONJ-SUBORD 因为;由于;既然
You use since to introduce reasons or explanations.I'm forever on a diet, since I put on weight easily...
我永远都在减肥，因为我很容易长胖。
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6
不要混淆 for 和 since。for 用来表示过去、现在或将来的一段时间，还可表示某段时间内某事没有发生：She slept for eight hours (她睡了 8 小时)，He will be away for three weeks (他将离开 3 周)，I hadn't seen him for four years (我有 4 年没见他了)。since 用来表示某段时间的起点：She has been with the group since it began (该集团创建之初她就在那儿工作)，the first civilian president since the coup 17 years ago (17 年前政变后的第一个平民总统)。since 还可用来指某事发生的最后时间，或某段时间内某事没有发生：She hadn't eaten since breakfast (早饭后她一直没吃过东西)，It was a long time since she had been to church (她很久没去教堂了)。because，as，since，for 均可用来解释原因。because 最常用，用来回答以 why 开头的疑问句。 as 或 since 可用来代替 because 引导一个表示原因的从句，尤用于书面语：a note about The National Portrait Gallery, as the word ‘Gallery’ can be misleading (对 The National Portait Gallery 的注释，因为 Gallery 一词容易令人误解)，Since the juice is quite stong, you should always dilute it (由于果汁很浓，你必须加水稀释)。在讲述故事时，for 用来对某事作出解释或论证：He seemed to be in need of company, for he suddenly went back into the house (他似乎需要人作伴，因为他突然返回了房子里)。注意，because 是连词，用于连接一个句子中的两个意思：I'm unsocial, because of my deafness (我不善交际, 因为我耳朵聋)。
D
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You 've grown since the last time I saw you !
自从我上次见到你后，你又见长了！
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She 's a changed woman since she got that job .
她自从得到了那份工作，变得判若两人。
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She 's been using since she was 13 .
她从13岁起就吸毒。
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His quality of life has improved dramatically since the operation .
手术后他的生活质量大大改善了。
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It 's a long time since they left .
他们已经离开很久了。
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It 's been two weeks now since she called .
她到现在已经有两个星期没来电话了。
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I had been out since I was 17 .
我从17岁起就公开我是同性恋。
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The children are completely out of control since their father left .
这些孩子自他们的父亲离开后就无法无天了。
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It 's been an age since we 've seen them .
我们有很长一段时间没有见到他们了。
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Since he changed jobs he 's looked like a new man .
他跳槽之后像换了一个人似的。
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I haven 't seen him since the summer before last .
我已有两个夏天没见过他了。
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They 've been best friends since they were children .
他们从孩提时起就是最要好的朋友。
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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。
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He had been with the company since its creation in 1989 .
他从1989年公司成立以来，就一直在那里工作。
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It 's exactly a year since I started working here .
我来这里工作已经整整一年了。
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I left in 1990 and I haven 't been back there since .
我于1990年离开那里，从那以后再也没有回去过。
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We 've come a long way since the early days of the project .
这项目开始以来我们已取得很大进展。
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She 's been working there since the beginning of last summer .
她自从去年夏初起就一直在那里工作。
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It 's twenty years since I 've seen her .
我已经二十年没见她了。
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It 's years since we last met .
我们多年没有见面了。
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The town has changed beyond recognition since I was last here .
自从我上次离开这里以来，这座小镇已经变得让人认不出来了。
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My life has been an empty shell since he died .
他死后，我的生活就成了一个徒有其表的空壳子。
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Since her hip operation she 's had a new lease of life .
她自髋关节手术以后活得更有劲了。
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The situation has changed somewhat since we last met .
自我们上次见面以来情况有些变化。
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The hotel has polished up its act since last year .
这家酒店自去年以来已经改善了服务水平。
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There 's been no word from them since before Christmas .
自圣诞节前就一直没有他们的消息。
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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。
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We 've lost a lot of custom since prices went up .
自从价格上涨以来我们失去了很多生意。
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This firm 's gone to the dogs since the new management took over .
这个公司自新的管理人员接手以来日渐衰败。
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Industry in Britain has been in decline since the 1970s .
英国工业自20世纪70年代以来一直在走下坡路。
一般不与现在时间发生关系，故常和动词的过去时或过去完成时连用。
After school he went home.
放学以后，他回家去了。
She began her study after moving to London.
搬到伦敦后她开始了自己的学业。
He came to see me after he had arrived.
他到达后就来看我了。
语气最强，表示因果关系，通常用来回答由 why 引导的疑问句。由 because 引导的分句置于句首时，须用逗号与主句隔开，置于句末时则不用隔开。
Because the traffic is so busy, she failed to arrive at the station on time.
因为路上交通太拥挤，她没能准时赶到车站。
He came back late because there was something wrong with his car.
他回来晚了，因为汽车出了故障。
如果所述理由是明显的或者已知的，则用 as 较 because 更为合适。
As it's raining, you'd better stay at home.
既然在下雨，你最好呆在家里。
He puts the ice cream into the fridge immediately, as it melts easily.
他马上把冰激凌放进冰箱，因为它很容易化掉。
for 属于并列连词，由它引导的分句表示补充说明性的理由，通常只能置于句末，且必须用逗号与前面的分句隔开。
He must have passed this way, for here are his footprints.
他肯定是从这条路走过去的，这里有他的脚印。
He has to work hard, for he wants to support his family.
因为要养家糊口，他必须努力工作。
当所述原因是已知的客观事实或被当作推断的理由时用 since，语气略强于 as。
Since he is absent, let's begin.
既然他不在，我们就开始吧。
Susan must have come back home, since her coat is not in the wardrobe.
苏珊肯定回过家，因为她挂在衣橱里的外套不见了。
同义词