It+is或has+段时间+since

1。

It’s been six years since we last saw each other。

自从我们上次见面已经有6年了。

It is/has been + 一段时间+since + 从句,
意为“自从……至今已经多久了”
翻译:1) It has been three years since they got married。

2) It has been three years since they stayed here。

答案：1）他们结婚已经三年了。

2）他们不在这儿已经三年了。

【拓展】It + be +时间段+before从句的两种翻译：
若主句为肯定句式:过多久才……
若主句为否定句式：没过多久就……
①It will be hours before he makes a decision.
②It was not long before she learned those poems by heart。

③It won’t be long before they understand each other.
答案：①要过好几个小时他才会作出决定。

②她没过多久就背过了那些诗。

③用不了多久他们就能互相了解。

【即学即练】
It wasn’t a few years _________we met each other.
A. since
B. before
C. until
D. after 【解析】选B。

句意:没过几年我们就见面了。

考查
句型It+ be +时间段+before从句。

故选B。

1。

It is /has two years ____he died。

A。

before B 。

since C。

when D. after
2. It will be five years ____he meets you again。

A. before B. since
C. when
D. after
3。

It was long ____she came back。

A. before
B. since
C. when D。

after
4。

It is almost five years ________ we saw each other last time. AA．before B．since Cafter Dbecause 答案:1。

B 2。

A 3.A 4。

B
高考题
1。

As is reported, it is 100 years _______ Qinghua University was founded。

(2011四川卷)
A。

when B. before C. after D. since
2。

It ______ long before we _______ the result of the experiment.
（上海春）
A. will not be; will know
B. is； will know
C。

will not be; know
D. is； know
1.C
2.C
单句改错
1。

Many a book have been published this year。

2.It is the first time that I had been here。

3。

It is/has been 3 years before I bought the book。

答案;1. have—has 2。

had—have 3。

bought——buy。