课件18张PPT。Unit 1
Grammar and usage
Present perfect tense 用正确的时态结构填空1. If it’s fine, we ____________ (go) fishing tomorrow.
2. He _______ (arrive) at the office at about 9:00 every day.
3. Listen to the girls. They ___________ (talk) in French now.
4. Tom _____ (fall) ill yesterday and ____ (have) to stay home for a whole day.
5. When he called me, I ____________ (have) dinner.arrivesare talkingwill gofellhadwas havingRevisionPresent
perfect
tensePolice in America have stepped up their search for a fifteen-year-old boy who went missing …
This incident has received great interest due to reports of …
I haven’t seen Justin since.
4. It’s happened to me!
5. When asked …, who has taken charge of the case, told …
6. So, while we have not dismissed the idea, we are looking into other possibilities as well.
Are you familiar with these sentences?现在完成时 现在完成时用来表示之前已发生或完成的动作或状态,其结果和现在有联系。也可表示从过去开始持续到现在的动作或状态。其构成: have (has) +过去分词 have/ has not + 过去分词Ex. Complete the following sentences.1.We ___________(study) English for five years.
2.They _________ (live) in the south since their daughter was born.
3.I _________ (read) your article three times. It’s well written.
4.The student __________ (finish) her homework already.
5.The police ______________ (just finish)searching the area.
have studiedhave livedhave readhas finishedhave just finished现在完成时标志性时间状语for +段时间
since+ 过去时间点
in/ during/ over the past few years
so far
already / yet
never/ ever
twice/ many times…Please make some sentences using the following verbs:
learn / finish / write / read/ play/ wait/… 1) 表示过去发生或已经完成的某一动作对现在造成的影响或结果。通常与表示包括现在在内的时间副词just,already, before, yet, never, ever等状语连用。例如:
I have never heard of that before.
Have you ever ridden a horse?
She has already finished the work.
I’ve just lost my science book. 现在完成时的用法: 2)表示过去已经开始,持续到现在,也许还会持续下去的动作或状态。常与时间状语for+ 段时间,since+点时间,以及 so far, these days, in the past few years 等连用。
I haven’t seen her these days.
She has learnt English for 3 years.
They have lived here since 1990.
What has happened to the USA in the last 350 years?3)表示重复性的动作,通常带有twice,three times等表示次数的词。
I have been to Beijing twice. 4) have been (to)和have gone (to)的区别: have / has been (to) 表示“曾经去过”某地,说话时此人很可能不在那里,已经回来。侧重指经历。
have / has gone (to) 表示某人“已经去了”某地,说话时此人在那里,或可能在路上,反正不在这里。
He has been to Beijing. (人已回来,可能在这儿)
He has gone to Beijing. (人已走, 不在这儿)用于现在完成时的句型①It is the first / second time that …
在这个结构中的从句部分,用现在完成时。如: It is the first time that I have visited the city. This is the first time I’ve heard him sing.②This is + 形容词最高级 + that…在这种结构中,that从句要用现在完成时。如: This is the best film that I’ve ever seen. 注意:表示短暂时间动作的词,如come, go, die, marry, buy, receive 等的完成时不能与for, since等表示一段时间的短语连用。
1.I've?left?Shanghai?for?three?days.
2.I've?been?away?from?Shanghai?for?three?days.
3.I?left?Shanghai?three?days?ago.?
4.It?is?/has?been?three?days?since?I?left?Shanghai.
5. I have received her letter for two weeks.
×√√√right or wrong?×Translate these sentences into English. 汤姆回来了。
汤姆回来一个多星期了。Tom has come back.Tom has been back for over a week.2. 你今天下午什么时候离开学校的?
你离开学校多久了?When did you leave school this afternoon?How long have you been away from school?3. 他在1998年买了这辆自行车。
他自从来到我们学校就买了这辆自行车。He bought the bike in 1998.He has had the bike since he came to our school.4. 上个月我借了这本书。
这本书我借了一个月了。I borrowed the book last month.I have kept the book for a month.一般过去时与现在完成时的区别 一般过去时表示过去某个时间发生的动作,与具体的过去时间状语连用如:ago, yesterday, last week, the other day, in 2011等。
现在完成时强调对现在的影响,不与具体过去时间状语连用,但可与ever,never,before,just,already 连用。
I finished my homework an hour ago.
I have already finished my homework.1 We ___________English for about five years. We ______to study it five years ago .(study, begin)
2 They _________ to the south in 1990 and they _________ there since then. (move, live)
3 Eric _________home last year and ____________back. (leave, just come)
4 My brother _________ to see my grandpa last week. He __________ him three times this month. (go, visit)
have studiedbeganmovedhave livedleftwenthas visitedhas just comePractice: Fill in the blanksExercises: My friend Jack has just sent me an e-mail, telling me about his travels around the world. He ____________ (just be) to Qomolangma base camp and ____ (see) a Yeti there. He is still very excited about it. He __________ (visit) the great pyramids in Egypt too. He says that he ______ (love) Egypt but he ____________ (not visit) all the pyramids yet.has just beensawhas visitedloveshasn’t visited He _________(see) crop circle in many places. though he _____________(never meet) any aliens, he believes they do exist. He __________ (travel) to the Indian Ocean many times looking for treasure.
Although he _________ ( find) many sunken ships, he ____________ (not find) any treasure yet.
____ he _____ (be) to the Great Wall before? I’m not sure—but I have.has seenhas never methas traveledhas foundhasn’t foundHasbeen