英语从句里It is/was...后面用since或before究竟有什么区别?不太清楚!麻烦说得详细点.还是不太明白,仅仅是从意思上来辨别吗?那很多选择题两个选项都有,到底这样的题目有什么特征?

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英语从句里Itis/was...后面用since或before究竟有什么区别?不太清楚!麻烦说得详细点.还是不太明白,仅仅是从意思上来辨别吗?那很多选择题两个选项都有,到底这样的题目有什么特征?英语从

英语从句里It is/was...后面用since或before究竟有什么区别?不太清楚!麻烦说得详细点.还是不太明白,仅仅是从意思上来辨别吗?那很多选择题两个选项都有,到底这样的题目有什么特征?
英语从句里It is/was...后面用since或before究竟有什么区别?不太清楚!麻烦说得详细点.
还是不太明白,仅仅是从意思上来辨别吗?那很多选择题两个选项都有,到底这样的题目有什么特征?

英语从句里It is/was...后面用since或before究竟有什么区别?不太清楚!麻烦说得详细点.还是不太明白,仅仅是从意思上来辨别吗?那很多选择题两个选项都有,到底这样的题目有什么特征?
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”.
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”.
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的用法
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.






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”.
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”.
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

从句如果用since引导,表示自从…句子用现在完成时,从句如果用before引导,表示在…之前,句子用过去时

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...

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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”。
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”。
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的用法
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。






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”。
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”。
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

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it is/was reported that 后面从句分别是什么时态? 英语的一句从句It is like where I was growing up是什么从句 英语从句里It is/was...后面用since或before究竟有什么区别?不太清楚!麻烦说得详细点.还是不太明白,仅仅是从意思上来辨别吗?那很多选择题两个选项都有,到底这样的题目有什么特征? it was 和it is +before这两个的时态要注意吗it is 3 years before they.和it was 3 years before they.从句主句后面的时态怎么用 英语中,从句:we went to a restaurant ( ) near my home括号里填哪一个词?(which,that,who,where.还是什么什么)还有括号后面用不用加is或者was.快点回答我. It is/has been +时段+since从句 It was/be+时段+before从句 用些这英语句型造个句It was +时点+when从句This is/was +第几次+that从句 It was for the first time that后面从句用什么时态 it was said that 后面的句子是什么状语从句 it is/was the time that it is/was the frist time that 后接从句用什么时态? it is that 从句中is 后面的可以为? 关于英语同位语从句It is the news that Jim win the game,一般后面从句用来描述前面的新闻,消息等,这从句时态是否要用一般现在时? It is no longer _______ it was 10 years ago,_______ it was so poorly equipped.It is no longer ____what___ it was 10 years ago,____when___ it was so poorly equipped.请问what引导的是主语从句还是表语从句?it是形式主语吗?后面when 【高一英语】【啥啥从句】it is very difficult to tell how many years age________ people made the first ship.A.it was whenB.was it whenC.it was thatD.was it that It looks as if it is going to rain.后面不该用was going It be reported that 中的be用 is 还是was?还有that从句中用什么时态? it is/was the first time +that+clause中从句用什么时态? It is(was) +强调部分+that (who)+从句 it was her carelessness____________her losing her job.(lead) 是粗心导致她失去了工作求告知it was 后面的用法难道没人会?it was 后面+从句用什么时态?