(牛津译林)高一英语必修二课件精选：Unit1TalesoftheunexplainedGrammarandusage.ppt(课件中不含音视频素材)

1、Why do we carry out space exploration?Grammar and usageWe have been doing research on space exploration.(present perfect continuous tense)We have done research on space exploration.(present perfect tense)1.Do you know when we should use the present perfect tense?A.When we talk about things that happ

2、ened in the recent past,but are connected to the present.e.g.The disappearance of Justin has made Kelly very unhappy.B.When To talk sth that started in the past,and is still happening now.e.g.I have not seen Justin since last Friday nightC.When to talk about actions that were completed only a short

3、time agoe.g.The police have just finished searching the area.D.For repeated actionse.g.some villagers say that they have seen UFOs many times.2.What is the basic structure of the present perfect tense?subject+auxiliary verb(has/have)+done+objectsubjectaux.vmain vobject+I haveseenET.+You haveeatenmin

4、e._Shehasnotbeento Rome._Wehavenotplayedfootball.?HaveyoufinishedIt?HashedoneIt?3.We often use it with time expressions.Such as:already ever for just lately never recently since yetQ1.Whats the difference between already and yet?e.g.The boy has already come here.I havent heard anything from him yetT

5、ip:Already is for affirmative statements;Yet is for negative statementsQ2.Whats the difference between for and since?e.g.1.we havent seen him for two years.2.We havent seen him since 2002.Tip:for+a period of time;Since+a point in timeMy friend Jack has just sent me an e-mail,telling me about his tra

6、vels around the world.He _(just been)to Qomolangma Base Camp and_(see)a Yeti there.He is still very excited about it.He_(visit)the Great Pyramid in Egypt too.He says that he _(love)Egypt but he _(not visit)all the pyramids yet.He_(swim)in Loch Ness,but luckily he _(never meet)the Loch Ness Monster!H

7、e_(dive)in the Indian Ocean many times looking for treasure.Although he_(find)many sunken ships,he _(not find)any treasure._he_(be)to the Great Wall before?Im not surebut I have!has just beensawhas visitedloveshasnt visitedhas swumhas never methas divedhas foundhasnt foundHas beenPresent perfect con

8、tinuous tense1.When to use it?A.When we talk about actions that started in the past and are still continuing.e.g.I have not been sleeping well since I returned home.B.When we talk about actions that have just finished but are still connected to the present in some way.e.g.Kelly:Sorry Im late.Have yo

9、u been waiting long?Mavis:Yes.Ive been waiting for an hour.(non-stop)2.What is the structure?subject+have/has been doing+Fill in the missing words.They(2)_ to me since 1964.They speak English well!have been talkingI also know some Yetis.I(3)_ photos of them since 1977.have been takingI(4)_ the Loch

10、Ness Monster on the Internet too.have been watchingRecently I(5)_ an unusual number of UFOs!have seenI(6)_ a book on UFOs.I should be able to finish it early next year.have been writingHomework:评价手册Lesson5See you next timePresent perfect orpresent perfect continuous?Grammar and usage(2)1.Completed i

11、n the recent past/started in the past and is still happening.Li Jia has read a book about stonehenge.(She finished reading the book.)Li Jia has been reading a book about stonehenge.(She is still reading the book.)2.For repeated actions/for non-stop actionse.g.I have visited Egypt twice this months I

12、 have been touring Egypt for two monthsAsking questions with:How many or how much/how longe.g.how many times have you swum in the lake?how long have you been swimming in the lake?3.A state verb or an action verb/an action verbe.g.I have had this camera for five years.I have taken photos of UfOs with

13、 camera.I have been taking photos of UFOs with this camera.4.never,yet,already and ever is just for present perfect tense.Ive never visited Paris Ive already been to Paris.Choose the right words_1.Where do you think the boy has been waiting?2.What have the aliens been travelling in?What does it look like?3.Who else have the aliens talked to?4.What other planets have the aliens visited?Homework:评价手册lesson 6