it-is-since-when-before用法

1、10.It was/will be+時(shí)間段+before.該句型的is后可接long或一段時(shí)間?？隙ň渥g為“過(guò)多久過(guò)多久才才”；過(guò)了多久將會(huì)。；過(guò)了多久將會(huì)。否定句譯為“沒(méi)多久就”。例如：It was a long time before I got to sleep again.It will be hours before he arrives here.It was not long before he left his home town.It will be five years before we meet again.11It is since該句型表達(dá)該句型表達(dá)“自從自從以來(lái)已

2、經(jīng)多久了以來(lái)已經(jīng)多久了It is 15 years since the war ended.It is just a week since we arrived here.It is ten years since he left his home town.It must be almost 5 years since we last met.從句中可用現(xiàn)在完成時(shí)。例如：It is three years since Ive seen him. = It is three years since I saw him.since從句如為延續(xù)性動(dòng)詞，用一般過(guò)去時(shí)，從句如為延續(xù)性動(dòng)詞，用一般過(guò)去時(shí)

3、，表示表示“動(dòng)作的結(jié)束動(dòng)作的結(jié)束”。例如。例如：Its years since I enjoyed myself so much.It is four years since she was a nurse.How long is it since you were in London.12.It is when做。時(shí)間是做。時(shí)間是該句型中when引導(dǎo)的是時(shí)間狀語(yǔ)從句，其前面是表示時(shí)間的詞作表語(yǔ)，強(qiáng)調(diào)句型中that前面被前調(diào)的是狀語(yǔ)。例如：It was ten oclock in the evening when he came back.It is twelve oclock at midn

4、ight when they arrived at a lovely village.It was 2005 when he left his home town.9. -Did Jack come back early last night? -Yes. It was not yet eight oclock _ he arrived home. A. beforeB. whenC. that until10. Scientists say it may be five or six years _ it is possible to test this medicine on human

5、patients.A. sinceB. afterC. beforeD. wh11. He was told that it would be at least three more months _ he could recover and return towork.A. whenB. beforeC. sinceD. that12. It was evening _ we reached the little town of Winchester.A. thatB. untilC. sinceD. beforebcbc13. The field research will take Jo

6、an and Paul about five months; it will be a long time _ we meet them again.A. afterB. before C. sinceD. when15. That was really a splendid evening. It is years _ I enjoyed myself so much.A. whenB. thatC. before D. since16. It was some time _ we realized the truth.A. whenB. until C. since D. beforebdd 1,It was two years _he realized the truth2. It is /has been two _ he lived here 3. It was midnight _ he arrived home. 4. It was at midnight _ he arrived home 5.It wont be long _ he finishes the work6.It has been three years _he worked here 7,It has been three years _ _he smokedbeforesincewhe