when,since,before,that句型
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It+be+……+that/since/before/when用法辨析
1.it was+ (时刻,或时间点)+ when sth. happened.当某事发生时,是几点钟或哪一年如:
It was 1997 when Hongkong returned to China.
It was five o'clock when we arrived at the small mountain village.
对比强调句型:It was at five o'clock that we arrived at the small mountain village.
It+ is/ was+…+that…多用于强调。
判断方法如下:去掉it、be和that,余下的部分仍是一个完整的句子,这样的句子一定是强调句。
2.it was+一段时间+ before sth happened. 过了一段时间之后,某事才发生了。如:
it was two years before Macao returned to China.
it will be +一段时间before sth. happens.要过一段时间之后,某事才会发生。
或不用过多久,某些就将发生:it won't be long before sth. happens.
It won’t be long before you see him again.
没过多久就…
It was long before they escaped from the prison.
过了很久才….
3.it is (=has been)+一段时间since sth. happened.自某事发生以来,(时间)已经过去。。。了。
如:It is 11 years since Hongkong returned to China.香港回归已经有11年了。
若从句中的动词是终止性动词,意为:“从开始……多久了”例如:
It has been five years since she left home.(她离家已经十五年了)It was four years since he had died.(到当时为止,他已死去四年了)若从句中的动词是延续性动词,意为:“不做某事已有多久了”例如:
It is two days since she was ill.(她病好了两天)
It is two years since he studied English.(他已有两年没学英语了)练习:请用before,since,that,when填空。
1.It was last Sunday _____ I came across Mr Brown.
2.It was midnight _____ the young couple came back from the ball.
3.It won’t b e a minute _____the lunch is ready.
4.It is two weeks _____the Smiths lived in our village.
5.It was not until 1920 _____ regular radio broadcasts began.
6.Was it during the Second World War _____ he died?
7.It has been one year _____ I got the job.
8.It w asn’t long _____ they drove the enemy off their country.
9.It will be two years _____ we meet again.
10.It is years _____ I enjoyed myself so much.