八年级英语下册 Unit 1 Past and Present Grammar 2课件

1、Unit1 Friends【Grammar】Present perfect tenseLearning aims1.掌握现在完成时的基本结构、基本用法和动词过去分词的变化规律。2.理解并运用常和现在完成时连用的时间表达方式。3.能够在语境中正确运用现在完成时。Guide One1.Read the following sentences.(2(1).Ive lived here since I was born.(2).Have you ever moved house?(3).Has the town changed a lot over the years?(4).The governme

2、nt has turned part of the town centre into a new park.(5).However, most of my old friends have moved away.(6).It has become impossible for us to see each other as often as before.(7).Weve lived in this area since then.(8).Have you seen my food?Think?(41.以上的句子都用了_.句子中的_ 和_由主语确定。谓语动词用_.它的结构是_.现在完成时hav

3、ehas过去分词have/has+动词的过去分词2.判断句中时态是一般过去时还是现在完成时。(3(1).He went to the cinema last night.(2).He has already seen many great films.(3).Marry has forgotten to do her homework.(4).They have been in Hong Kong since 1998.(5).We joined the drama club two years ago.3.理解现在完成时，给其定义.pastpresentEddie has lived wit

4、h Millie since he was born.Eddie has lived with Millie for four years.pastpresent4 yearsEddie was born four years ago.(1).Read the following sentences and understand the meaning of the present perfect tense.I have lived here since I was born.Eddie has just eaten Hobos food.I have already read this b

5、ook many times.表示从过去开始一直持续到现在的动作或状态。表示过去发生，并对现在有一定影响的动作。表示某事直到现在发生了许多次。现在完成时的含义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，动作或状态发生在过去但它的影响现在还存在；也可表示持续到现在的动作或状态。The Present Perfect Tense (现在完成时）Guide Two1.参阅P13和P122-123快速写出下列动词的过去式和过去分词。(4Have a match. Who writes best?be_ _ eat_ _see_ _ change_ _move_ _ live_

6、_get_ _ become_ _forget_ _ marry_ _stop_ _ teach_ _come_ _ have_ _动词的过去分词变化规则可参阅动词的过去式变化规则2.Finish Part A on Page 14.(3Part Aborrowed/hoped/made/got/planned/cried/sent/watched/said/grown/hit/enjoyedGuide Three1.Read the context in the form on Page12 and finish the following blanks.(4(1).主语是_ _ _ _时，

7、用have主语是_ _ _时，用has(2).肯定句_ 否定句_一般疑问句_句中的have/has可看做助动词使用，have/has可直接在后面加_表否定，have not=_,has not_; have/has也可直接_表疑问。2.Change them according to the requirements.(4(1).Have you ever moved house?(否定回答)(2).Has the town changed a lot over the years?(肯定句)(3).The government has turned part of the town cent

8、re into a new park.(一般疑问句,并作出肯定回答)(4).Most of my old friends have moved away.(否定句)3.Complete the sentences using the present perfect tense. They _(finish) their homework.2. Mr and Mrs Li _ (not come) back yet.3. John _(play) this computer game a few times.havent comehave finishedhas played4. We _(no

9、t see) that film yet.5. Mr Dong _(repair) over ten bicycles since last Monday.6. You _(not visit) me for a long time.havent seenhas repairedhavent visitedComplete the conversation using the correct forms of the verbs in brackets.Millie: (1)_ you _(see) any exhibitions recently, Sandy?Sandy: No, I (2

10、)_. What about you?Millie: Well, I (3)_(see) one. I saw it at the history museum last week.Sandy: Whats it about?Have seen have seenhaventMillie: I (4)_(forget) the title. Its about changes in Beijing over the past century.Sandy: Oh, yes. I (5)_(hear) about it.(6)_ your cousin _(go) with you?Millie:

11、 No, he (7)_. He (8)_ (be) very busy this week.have forgottenhave heardHave gonehasnthas beenThink?如何识别运用现在完成时？现在完成时有一些时间标志词：already/yet/ever/for/just/never/recentlysince/yetHow to use them?already肯定句，表示已经发生的事ever疑问句，表示“曾经”for肯定句/否定句/疑问句，表示一段时间just肯定句，表示“刚刚”never否定句，表示 “从不”recently肯定句/否定句/疑问句，表示 “最近

12、”since肯定句/否定句/疑问句，表示 “自以后”yet疑问句/否定句,表示 “已经” 或 “还没有”Practice选择正确的词填空（2(1).I_come back from the supermarket. (for/just/since)(2).I have_ been to Chengdu. (for/never/yet)(3).He has worked there _ he left school. (already/just/since)(4).She has known Sam_ nine years. (for/never/since)(5).Have you_ ridden a horse? (ever/for/yet)Practice in class(10Finish Part B C