Unit1TalesoftheunexplainedGrammarandusage1(牛津译林版必修2)课件.ppt

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1、TalesoftheunexplainedGrammarandusageUnit 1Presentperfecttense&PresentperfectcontinuoustensePresent perfect tenseStep1Lead-inGo over the news story on Page 2 and find the sentences using the present perfect tense.Please explain why the tense is used in these sentences.The disappearance of Justin_ (ma

2、ke)Kelly very unhappy.has made1.We use the present perfect tense to talk about things that happened in the recent past,but are connected to the present.Step 2 Points 1-6 I _(not see)Justin since last Friday night.have not seen2.We also use the present perfect tense to talk about something that start

3、ed in the past,and is still happening now.3.We use the present perfect tense when the exact time of an action is not clear or important.We use it with time expressions such as:already ever for just lately never recently since yet Exercise:completethefollowingsentenceswiththepropertense:(1)We _(study

4、)English for about five years.(2)They _(live)in the south since their daughter was born.(3)I _(read)your article three times.Its well written.(4)The student _(finish)her homework already.(5)Eric _ just _(go)back to his hometown.have studiedhave livedhave readhave finishedhas goneWe use already for a

5、ffirmativestatements and yet for negativestatements.Weusefor+aperiodoftimeandsince+apointintime.4.We use the present perfect tense to talk about actions that were completed only a short time ago.The police have just finished searching the areas.5.We can also use the present perfect tense for repeate

6、d actions,that is,we use the present perfect tense with the time expressions once/twice/three times6.Form:have/has+the past participle of the verbStep 3 Read the diary entry and then complete it using the correct forms of the verbs in brackets.Answers:(2)saw (3)has visited (4)loves (5)hasnt visited

7、(6)has swum (7)has never met (8)has dived (9)has found (10)hasnt found (11)Has,been Present perfect continuous tense1.Form:have/hasbeen+thepresentparticipleoftheverb.2.Weusethepresentperfectcontinuoustensetotalkaboutactionsthatstartedinthepastandarestillcontinuing.I have not been sleeping well since

8、 I returned home.Past _ Presentnot being able to sleep wellI returned home.Im still not sleeping well.3.We also use the present perfect continuous tense to talk about actions that have just finished but are still connected to the present in some way.Kelly:Sorry Im late.Have you been waiting long?Mavis:Yes.Ive been waiting for an hour.past_ One hour ago PresentMavis started waiting for Kelly.Kelly arrives.have been observing have been talking have been taking have been watching have seen have been writing1.PrepareGrammarandusage.2.FinishPartC1andC2inWorkbook.Homework