whenbeforesince区别及用法学习教案

1、会计学1whenbeforesince区别区别(qbi)及用法及用法第一页，共12页。第1页/共12页第二页，共12页。，相当于相当于since; considering that. It was foolish of you to take a taxi when you could easily walk there in five minutes .第2页/共12页第三页，共12页。第3页/共12页第四页，共12页。(1) before sb can/ could 某人还没来得及某人还没来得及Before I could get in a word ，he had measured me

2、 我还没来得及插话，他就给我量好了尺寸我还没来得及插话，他就给我量好了尺寸(2) It will be/was +时间时间(shjin)段段+ before 过一过一段时间段时间(shjin)才才 It will be 4 years before he graduates. (3) 他还有四年时间他还有四年时间(shjin)毕业了。毕业了。(4) It was 5 minutes before he left.过过5分钟才离分钟才离开开(5) 2.before句型句型(j xn)第4页/共12页第五页，共12页。 It wont be long before.（从句用现在时）（从句用现在时）

3、 It wasnt longbefore.（从句用过去（从句用过去(guq)时）时）没过多久没过多久/用不了多久用不了多久就就eg:It wasnt long before i found a job.It wont be long before our contry becomes a developed country.我们国家很快就会成为一个我们国家很快就会成为一个发达国家。发达国家。 before long (adv.)不久，不久，long before 很久以前很久以前 第5页/共12页第六页，共12页。 (3) had done before （才） We had sailed f

4、our days and four nights before we saw land. 我们航行了四天四夜才见到陆地(ld)。 (4) had not done - before - 不到就 We hadnt run a mile before he felt tired. 我们还没走到一英里路他就觉得累了。第6页/共12页第七页，共12页。 It is/has been时间段since sb. diddid动作为瞬间动词（非延续性），翻译为自从某事发生以来有多长时间 It is 5 years since he left Beijing . 他离开(l ki)北京5年了It has bee

5、n 3 years since he came back from abroad.自从他回国已经三年了 3.since句型句型(j xn)第7页/共12页第八页，共12页。 It is/has been时间段since sb. diddid动作为持续动词（延续性），翻译为自从不做某事有多长时间 It has been 5 years since he was a student .他不当学生(xu sheng)有5年了It is 5 years since he lived in beijing . 他不在北京居住有5年了 3.since句型句型(j xn)第8页/共12页第九页，共12页。1

6、. (04北京(bi jn)春) We were swimming in the lake _ suddenly the storm started. A. whenB. whileC. untilD. before2. (02上海) He was about to tell me the secret _ someone patted him on the shoulder. A. as B. untilC. whileD. when3. (05上海) He transplanted the little tree to the garden _ it was the best time f

7、or it. A. whereB. when C. that D. until5. (06辽宁) He was about halfway through his meal _ a familiar voice came to his ears. A. why B. where C. when D. whileExercises:A. whenD. whenB. whenB. whenC. when第9页/共12页第十页，共12页。6. (06天津(tin jn) The cost of living in Glasgow is among the lowest in Britain, _ t

8、he quality of life is probably one of the highest. A. since B. when C. as D. while7. (04年江苏) _ I accept that he is not perfect, I do actually like the person. A. While B. Since C. Before D. Unless D. A. 8._ entered the office when he realized that he had forgotten his report. A. He hardly had B. Had

9、 he hardly C. Hardly had heD. Hardly he had C第10页/共12页第十一页，共12页。9. (03年北京(bi jn) He made a mistake, but then he corrected the situation _ it got worse. A. untilB. whenC. beforeD. as10. (04福建) Scientists say it may be five or six years _ it is possible to test this medicine on human patients. A. sinceB. afterC. beforeD. when11. (06四川)Why didnt you tell him about the meeting?He rushed out of the room _ I could say a word. A. beforeB. unti