SINCE用法 since的所有用法。
since\u7684\u7528\u6cd5\u3002since\u662f\u4ec0\u4e48\u610f\u601d\uff1f\u7528\u6cd5\u662f\u4ec0\u4e48\uff1f
since\u7684\u7528\u6cd5\u6709\u54ea\u4e9b
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
since的用法主要有两点：一是表示“自从……以来”，二是表示“既然”之意。但如果只了解词的含义，而不了解其用法，在使用时就会造成错误。例如：I have not heard from him since I lived in Shanghai.
不少人会望文生义，将该句译为：“自从我住在上海以来，就再也没有收到他的信了。”而实际上这个句子的译文并非如此，那么正确的含义是什么呢？
下面谈谈since作连词引导时间状语从句的用法。
一、若since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”。如：
He has studied very hard since he came to our school.自从他来到我们学校，他学习就非常努力。
We have been missing them since they left here自从他们离开这里，我们就一直很想念他们。
这是最常见的一种用法，此处不再多述。
二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时，则从句表示的时间是“从那持续动作或状态结束时算起”。如：
I haven’t heard any noise since I slept. Sleep 为持续性动词，sleep的动作结束时，即“醒来”时，这句应译为“我醒后还未听到任何声音”。
John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约，他不当教师已经三年了。
本文开始出现的那个句子就可以译为“自从我离开上海，就再也没有收到他的信。”这种译法常被人们误用，我们不妨再多举几个例子看看：
How long is it since you lived in Shanghai?你离开（没住在）上海多久了？
It is half a month since he was a League member.他退团（不当团员）半个月了。
It’s been quite some time since I was last in London我离开伦敦已很长时间了。
比较：He has written to me frequently since I was ill.自从我病愈以来，他屡次给我写信。（从句谓语为状态动词）
He has written to me frequently since I fell ill.自从我生病以来，他就屡次给我写信。（从句谓语为终止性动词）
三、若since引导的状语从句的谓语为持续性动词的现在完成时，则表示动作和状态延续到现在（说话时刻），其表示的时间的起点应从动作发生之时算起。如：
I haven’t heard from him since he has lived there。
这里has lived表示动作的持续性，时间的起点应从：“开始居住”时算起。因此此句可理解为“自从他（开始）住在那儿起，我就一直没收到他的来信”。
Since we have owned a car, we have gone camping every year。自从我们自己有了汽车，我们每年都去野营。
试比较：1. Since I’ve been at this school, we have had three headmasters.自从我到这所学校，我们已换了三个校长了。
Since I was at this school, they have had three headmasters.自从我离开这所学校，他们已换了三个校长了。
2.He has never been to see me since I have been ill. 自从我生病以来，他从未来看过我。
He has never been to see me since I was ill. 自从我病愈以来，他从未来看过我。
由此可见，since引导的从句持续动词的一般过去时和现在完成时所表示的意思恰好相反。换言之，前者以肯定的语法形式反映着否定的逻辑内容，而后者的形式与内容是一致的。
至于It is +一段时间+since…的句型与It has been +一段时间+since…意思相同。前者是规范说法，后者是口语说法。
应注意的是，在这种结构中，since引导的从句绝对不能用否定式的谓语动词来表示否定意义，下面两句都错了：
It is a long time since he didn’t study English.
It’s two months since you didn’t come to see me.
正确的说法为：
It’s a long time since he studied English 他好久没学英语了。
You haven’t come to see me for two months. 你有两个月没来看我了。
我想你问这个问题主要是为了应付考试，那么我就从考试的角度来帮你解答一下，希望对你有所帮助！
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.
since的用法主要有两点：一是表示“自从……以来”，二是表示“既然”之意。但如果只了解词的含义，而不了解其用法，在使用时就会造成错误。例如：I have not heard from him since I lived in Shanghai.
不少人会望文生义，将该句译为：“自从我住在上海以来，就再也没有收到他的信了。”而实际上这个句子的译文并非如此，那么正确的含义是什么呢？
下面谈谈since作连词引导时间状语从句的用法。
一、若since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”。如：
He has studied very hard since he came to our school.自从他来到我们学校，他学习就非常努力。
We have been missing them since they left here自从他们离开这里，我们就一直很想念他们。
这是最常见的一种用法，此处不再多述。
二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时，则从句表示的时间是“从那持续动作或状态结束时算起”。如：
I haven’t heard any noise since I slept. Sleep 为持续性动词，sleep的动作结束时，即“醒来”时，这句应译为“我醒后还未听到任何声音”。
John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约，他不当教师已经三年了。
本文开始出现的那个句子就可以译为“自从我离开上海，就再也没有收到他的信。”这种译法常被人们误用，我们不妨再多举几个例子看看：
How long is it since you lived in Shanghai?你离开（没住在）上海多久了？
It is half a month since he was a League member.他退团（不当团员）半个月了。
It’s been quite some time since I was last in London我离开伦敦已很长时间了。
比较：He has written to me frequently since I was ill.自从我病愈以来，他屡次给我写信。（从句谓语为状态动词）
He has written to me frequently since I fell ill.自从我生病以来，他就屡次给我写信。（从句谓语为终止性动词）
三、若since引导的状语从句的谓语为持续性动词的现在完成时，则表示动作和状态延续到现在（说话时刻），其表示的时间的起点应从动作发生之时算起。如：
I haven’t heard from him since he has lived there。
这里has lived表示动作的持续性，时间的起点应从：“开始居住”时算起。因此此句可理解为“自从他（开始）住在那儿起，我就一直没收到他的来信”。
Since we have owned a car, we have gone camping every year。自从我们自己有了汽车，我们每年都去野营。
试比较：1. Since I’ve been at this school, we have had three headmasters.自从我到这所学校，我们已换了三个校长了。
Since I was at this school, they have had three headmasters.自从我离开这所学校，他们已换了三个校长了。
2.He has never been to see me since I have been ill. 自从我生病以来，他从未来看过我。
He has never been to see me since I was ill. 自从我病愈以来，他从未来看过我。
由此可见，since引导的从句持续动词的一般过去时和现在完成时所表示的意思恰好相反。换言之，前者以肯定的语法形式反映着否定的逻辑内容，而后者的形式与内容是一致的。
至于It is +一段时间+since…的句型与It has been +一段时间+since…意思相同。前者是规范说法，后者是口语说法。
应注意的是，在这种结构中，since引导的从句绝对不能用否定式的谓语动词来表示否定意义，下面两句都错了：
It is a long time since he didn’t study English.
It’s two months since you didn’t come to see me.
正确的说法为：
It’s a long time since he studied English 他好久没学英语了。
You haven’t come to see me for two months. 你有两个月没来看我了。
since可以引导时间状语从句和原因状语从句。不能引导定语从句。
引导时间状语从句一般放在后面。指从说话前某一时刻到说话时刻这一段时间。常用于完成时态。He has been living in Beijing since he was five.五岁后一直住在北京。
I have learned English since you left.你走了以后我就学了英语。
引导原因状语从句，主要是说明已知的必然性理由。只能放在前面引导，不能出现在后面。在后面常用as。 Since you are ill, you had better not go to school.既然病了，就别去学校了。另外记住，because常用来引导未知性必然理由。
since
since
[sIns; sins]
《源自古英语“其后”的意思》
连接词
1
a. [常 ever ~,用于表继续之完成式主要子句后] 自从…以后,自…以来,从…起一直
He has been abroad (ever) ~ he parted from me.
自从他离开我后,他一直在海外
I've been doing this work (ever) ~ I retired.
自从退休后我一直在做这工作
b. 从做…时候起 (到现在 [那时] 的期间)
The city has changed a lot ~ I have lived here.
自从我住在这里的时候起,这城市已改变了很多
He had not seen her ~ he (had) married.
自从他结婚之后他就一直没见过她
c. (~) 的构句] 自…后 (已过…年)
It is [has been] two years ~ I left school.
自从我离校后已经过了两年
2 既然…,因为…
S~ there's no more time, we must give it up.
既然不再有时间,我们必须放弃那件事
Let's do our best, ~ we can expect no help from others.
既然我们不能指望别人的帮助,我们就尽全力去做吧
介系词
1 a. [常 ever ~,常与表示继续之完成式连用] 自…以来 (一直)
They have been very happy together ever ~ their marriage.
自从他们结婚以来,他们一直快乐地生活在一起
S~ then I had wondered where he lived.
从那时起,我一直在想他住在哪里
S~ when have you lived here?.
从什么时候起你就住在这里了?
b. 从…以后 (时间[期间] (有多久)
It's a long time ~ her death.
她去世后已经过了很久
She has changed a good deal ~ her sickness.
自从她生病后她已经改变了很多
c. (口语)从发明[发现]…的时代以来
He is the greatest novelist ~ Henry James. (
口语)他是自亨利.詹姆斯以来最伟大的小说家
副词
(无比较级、最高级)
1
a. [常 ever ~] (那时) 以来 (一直) ,从那时以后 (直到现在)
He went to America twenty years ago and has stayed there ever ~.
二十年前他去了美国,从此就一直留在那里
b. 从那时起 (到现在 [那时] 的这一段期间) ,其后
I have not seen him ~.
从那时候起我一直没见过他
2 [常 long ~] (从现在起) (几年) 前
long ~
很久以前,好久以前
not long ~
不久以前,未久
He has long ~ arrived.
他好久以前就到了; 他到了很久了
since是什么意思？用法是什么？
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绛旓細adv.鑷︹︿互鍚庯紱姝ゅ悗锛涗箣鍓嶃俷.(Since) 锛堟硶銆佺編锛夋柊鏂紙浜哄悕锛夈since鐨勫洓绉鐢ㄦ硶锛1) since +杩囧幓涓涓椂闂寸偣銆锛堝鍏蜂綋鐨勫勾銆佹湀銆佹棩鏈熴侀挓鐐广1980, last month, half past six)銆2) since +涓娈垫椂闂达紜ago銆3) since +浠庡彞銆4) It is +涓娈垫椂闂达紜since浠庡彞銆備緥鍙ワ細1銆丼he hasn't ...
绛旓細Since甯歌鐨勫洓绉鐢ㄦ硶 1) since +杩囧幓涓涓椂闂寸偣 (濡傚叿浣撶殑骞淬佹湀銆佹棩鏈熴侀挓鐐广1980, last month, half past six)銆侷 have been here since 1989.2) since +涓娈垫椂闂+ ago I have been here since five months ago.3) since +浠庡彞 Great changes have taken place since you left.Considerab...
