The use about the word "since"."How long is it since you lived in shanghai?",is it as same as this sentence "How long is it since you left shanghai?" .Thanks for your help.

The use about the word "since"."How long is it since you lived in shanghai?",is it as same as this sentence "How long is it since you left shanghai?" .Thanks for your help.
The use about the word "since".
"How long is it since you lived in shanghai?",is it as same as this sentence "How long is it since you left shanghai?" .
Thanks for your help.

The use about the word "since"."How long is it since you lived in shanghai?",is it as same as this sentence "How long is it since you left shanghai?" .Thanks for your help.
两者一样.
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.
How long is it since you left shanghai?" .你离开上海多久了?
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”.
How long is it since you lived in Shanghai?你离开（没住在）上海多久了?
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”.

"How long is it since you lived in shanghai?"的意思是：
”自从你居住上海至今有多长时间了？“
How long is it since you left shanghai?的意思是：
你离开上海多长时间了？
很显然，前一句说的是”来了上海之后居住多久了“，而后面一句则是“离开上海多少了”，所以它们表达的意思不一样！

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"How long is it since you lived in shanghai?"的意思是：
”自从你居住上海至今有多长时间了？“
How long is it since you left shanghai?的意思是：
你离开上海多长时间了？
很显然，前一句说的是”来了上海之后居住多久了“，而后面一句则是“离开上海多少了”，所以它们表达的意思不一样！
有问题可追问，期待帮你更多！

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不一样，前者是到现在为止，你在上海住了多久？后者是：到现在为止，你离开上海多久？

句意不一样，但since的意思和用法是一样的，都表示：自从...起
1 你在上海住了多久了？（自从你住在上海)
2 你离开上海多久了？（自从你离开上海）Thank you first of all.If you have enough time please visit this webpage"http://wenku.baidu.com/view/71048837ee06eff...

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句意不一样，但since的意思和用法是一样的，都表示：自从...起
1 你在上海住了多久了？（自从你住在上海)
2 你离开上海多久了？（自从你离开上海）

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