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It is/was/has been/will be +一段时间如three years 哪些可以跟since或befo

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It is/was/has been/will be +一段时间如three years 哪些可以跟since或before,从句又应该各自用什么时态?
It is/was/has been/will be +一段时间如three years 哪些可以跟since或befo
1.

It is +

一段时间

+ since
从句

在
“It

is
+
时间段
+
since
从句
”
句型中,
如果
since
从句的谓语动词是瞬间性动
词,
表示肯定意义；
如果
since
从句的谓
语动词是延续性动词,
则表示否定意义.

例如：

1)

It is / has been ten years
since he left
Beijing.


译文：自从他离开北京已经十年了.


分析：
since
从句中的
left
是
leave
的过
去式,是瞬间性动词,表示肯定的意思,
left
译为
“
离开
”

2) It is / has been ten years since he was a
doctor.

他不当医生已经十年了.


分析：
since
从句中的系表结构表示一
种状态,这种状态是延续性的,表示否
定意义,译为
“
不是,不当
”


注：时间的计算一律从
since
从句的动
作完成或状态结束时算起.

2.

It
was
/
will
be
+

一段时间

+
before
从句

1)
在

“It
was
+
一段时间

+
before
从
句
”

句型中,
若主句是一般过去式,
从
句也是一般过去式时：





①

若主句是肯定句,
翻译成
“
过了多
长时间之后才
……”


例：

It was long before they found their son.
过
了很久他们才找到他们的儿子.




②

若主句是否定形式,
翻译成
“
没过
多久就
……”


例：
It was not long before the couple met
again.

没过多久这对夫妻就见面了.

2)
在

“It
will
be
+
一段时间

+
before
从句
”
句型中,若主句是一般将来时,从
句也是一般现在时：


①

若主句是肯定句,
翻译成
“
要过多长
时间之后才
……”

例：

It
will
be
half
a
year
before
I
come
back.




半年后,我才回来.


②

若主句是否定形式,翻译成
“
用不了
多久就
……”

例：

It
won’t
be
long
before
we
meet
again.

我们不久就会见面.
it has been three years since i left school（be away for）用括号内 It is/has been…since… It was/will be…before… 这两个句 It has been 5 years since this party----.如题 it is 3 years since Tom has been abroad “It be some time+ since短语或从句” 这里面的be用哪种形式呢?is,was还是has been呢 3.——( )has he been in Beijing —— Since he was three years ol "It has been ten years since he was a teacher."这句话有什么错误?可以怎么 2.He a teacher for three years.A.has be B.has been C.will be it is two years since I came here还是it has been two years sin 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 Mr Green has been in Beijing since three years ago. It is three years since he smoked.