英语人教版八年级下册第八单元第三课时ppt课件.ppt

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1、Unit 8,武安市第十一中学 彭国栋,Unit 8Have you read Treasure Island yet?,Section A 3Grammar focus-4c,Learning aims:,1.理解现在完成时态的用法和构成。2.会用现在完成时态做简单的提问和回答。3.掌握过去分词的构成规则。4.用现在完成时态写一篇过去和现在对比的文章。,Revision,Read the following sentences we have seen.,Have you read Little Women yet? Yes, I have./ No, I havent. Has Tina

2、read Treasure Island yet? Yes, she has. She thinks its fantastic.Have you decided which book to write about yet?Yes, I have. Ive already finished reading it. It was really good.,用法 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。 e.g. Have you had your lunch yet? Yes, I have. Ive just had it. (现在 我不饿了。),现在完成时,时间状语alre

3、ady, yet, just, ever, never, before,already和yet都可以作为现在完成时的标志词，但它们的用法不同。already一般用于肯定句中。如： We have already cleaned up our classroom. 注意：already用于疑问句中时通常表示惊奇。如： Have you finished your homework already? I cant believe it.,yet一般用于疑问句和否定句中。如： Have you seen her yet? The bus hasnt come yet.,构成现在完成时是由“助动词ha

4、ve / has+ 动词的过去分词”构成的。在现在完成时的各种结构中，have，has均为助动词，无实际意义，只起构成时态的作用，不可省略。当主语是第三人称单数时助动词用has，其余人称一律用have。,句式1. 肯定句：主语 + have / has + 过去分词 (+ 其他)2. 否定句：主语 + have / has + not + 过去 分词(+ 其他)3. 一般疑问句：have/ has + 主语 + 过去 分词(+ 其他) 答语：肯定回答：Yes,主语+have/has 否定回答：No，主语+havent/hasnt,句式肯定句：I have just washed my clot

5、hes。 我刚刚洗过衣服。2. 否定句：I havent seen the movie yet。 我还没看这部电影。3. 一般疑问句：-Has she arrived here？ -Yes，she has。 -No，she hasnt。 -她已经到这了吗？-是的，她到了。 -不，她还没到。,动词的过去式的变化和过去分词的变化并不完全相同。我们对它们作了一个大致的分类。 (注：例子中单词的变化顺序为：动词原形 动词的过去式 动词的过去分词),一、过去式和过去分词的变化相同规则变化：1. 一般在动词词尾直接加ed。如： pick picked picked; wish wished wished;

6、 stay stayed stayed2. 以不发音的e结尾的动词后面加d。如：like liked liked; hope hoped hoped; phone phoned phoned,3. 以“辅音字母 + y”结尾的动词，变y为i，再加-ed。如： study studied studied; hurry hurried hurried; reply replied replied4. 词尾只有一个辅音字母的重读闭音节动词，要双写辅音字母，再加-ed。如：stop stopped stopped; clap clapped clapped,不规则变化：5. 以不变应万变。如： let

7、 let let; put put put; read read read6. 若中间有双写e，则去掉一个e，单词末尾再加t。如： feel felt felt; keep kept kept; sleep slept slept,7. 结尾的字母d变t。如： lend lent lent; build built built; send sent sent8. 变为以-ought或-aught结尾。如： buy bought bought; bring brought brought; catch caught caught; teach taught taught,9. 以n或者en结尾。

8、如： be was/were been; see saw seen; know knew known; fall fell fallen,活学活用,1. Write the forms of the past tense and past participle: drink _ _ see _ _ find _ _ leave _ _ tell _ _ do _ _,drank drunk,saw seen,found found,left left,told told,did done,Why is Mr. Yang still in the teachers office? Maybe h

9、e _ his work yet. A. doesnt finish B. hasnt finished C. havent finished,B,Exercises,Use the words in brackets to complete the conversations.1. A: Would you like something to drink? B: No, thanks. _. (just/ drink some tea)2. A: I heard you lost your key. _? (find) B: No, not yet.,I have just drunk so

10、me tea,Have you found it,3. A: Do you know when Tom is leaving? B: _. (already/ leave) A: When _? (leave) B: This morning.4. A: Is your sister going to the movies with us tonight? B: No. _. (already/ see the film),He has already left,did he leave,She has already seen the film,5. A: What do your pare

11、nts think about our plan? B: I _. (not/ tell them/yet),havent told them yet,( )【广西贵港】 Do you know the movie Lost in Thailand? Yes. I _ it twice. Its funny. A. saw B. see C. have seen D. will see,C,中考链接,( )【黑龙江牡丹江】 Lunch? No, thanks. I_. A. will eat B. am eating C. have eaten( )【湖北黄冈】 Where is Tom? W

12、e cant find him anywhere. Perhaps he _ home. A. has come B. is going C. went D. was going,C,A,用法 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。 e.g. Have you had your lunch yet? Yes, I have. Ive just had it. (现在 我不饿了。),复习现在完成时,时间状语already, yet, just, ever, never, before,构成现在完成时是由“助动词have / has+ 动词的过去分词”构成的。在现在完成时的各种

13、结构中，have，has均为助动词，无实际意义，只起构成时态的作用，不可省略。当主语是第三人称单数时助动词用has，其余人称一律用have。,句式1. 肯定句：主语 + have / has + 过去分词 (+ 其他)2. 否定句：主语 + have / has + not + 过去 分词(+ 其他)3. 一般疑问句：have/ has + 主语 + 过去 分词(+ 其他) 答语：肯定回答：Yes,主语+have/has 否定回答：No，主语+havent/hasnt,一、过去式和过去分词的变化相同规则变化：1. 一般在动词词尾直接加ed。如： pick picked picked; wish

14、 wished wished; stay stayed stayed2. 以不发音的e结尾的动词后面加d。如：like liked liked; hope hoped hoped; phone phoned phoned,3. 以“辅音字母 + y”结尾的动词，变y为i，再加-ed。如： study studied studied; hurry hurried hurried; reply replied replied4. 词尾只有一个辅音字母的重读闭音节动词，要双写辅音字母，再加-ed。如：stop stopped stopped; clap clapped clapped,不规则变化：5

15、. 以不变应万变。如： let let let; put put put; read read read6. 若中间有双写e，则去掉一个e，单词末尾再加t。如： feel felt felt; keep kept kept; sleep slept slept,7. 结尾的字母d变t。如： lend lent lent; build built built; send sent sent8. 变为以-ought或-aught结尾。如： buy bought bought; bring brought brought; catch caught caught; teach taught taught,9. 以n或者en结尾。如： be was/were been; see saw seen; know knew known; fall fell fallen,Homework,Retell what you did yesterday and what you have done now.,