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Since用法学习，总记不住
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. 

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.  
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. 
25 kwi 2017 15:47
Komentarze · 3
記住這些複雜的規則，倒不如自己造幾個句子，然後再參照字典才會變成自己的東西。
18 maja 2017

"It is a long time since he didn't study English" is a very awkward sentence.  It almost feels like "since" is being used like "because" here.  "It seemed like it had been a long time since I missed my cat so much."  I.e., "it seemed long because one was missing someone".  "since he didn't study English", with the negative is difficult.  Its ambiguous.  For instance, maybe it took him a long time to graduate because he didn't study English?  Or maybe He has been studying English for a very long time, and it's been a long time since the time when he didn't study English.  Or maybe, you could be trying to say "It has been a long time since he stopped studying English."

"It's two months since you didn't come to see me" also isn't a great sentence.  "It has been two months since you stopped coming to see me."  Or "It has been two months since you last came to see me."  Or "It took two months because you never came to see me and help me shorten the time."

Anyway, all your other sentences seem good and I'm sorry I didn't read the grammatical notes more carefully.  Actually it seems like this discussion might be quite helpful to Chinese English learners.

Also, you should check out tatoeba.org where you can register and translate sentences into Chinese or look up usage for English words.

26 kwietnia 2017
对不起。语法的术语我集中地难。 所以我没有上心阅读。 I find grammar terms a bit tiring sometimes.  So I didn't read very carefully.

"I haven't heard any noise since I woke up" is better and in your Chinese, you use 醒 which is better with "woke up" too.  "I haven't heard any noise since I went to sleep" means something similar though its strange since presumably you were asleep and wouldn't hear anything.  However, "I haven't heard any noise since I slept" sounds a little like its implying that you were hearing imaginary noises because you hadn't slept in so long, and now that you've slept, its better.

“John is now with his parents in New York.  It is already three years since he was a teacher"  Two sentences is best.  You could use a ";" between them but its a bit strange.  And a "," would be a run on sentence.  不当教师 is "stopped being/no longer a teacher" I guess.  The sentences are all right.
26 kwietnia 2017
Rookie
Znajomość języków
chiński (mandaryński), angielski
Język do nauczenia się
angielski
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