八年级英语上册 Unit 6 Have you read Treasure Island yet?SectionA Grammar focus-4c精品课件 .ppt
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1、Unit 6 Have you read Treasure Island yet?,Section A 3 Grammar focus-4c,Revision,Read the following sentences we have seen.,Have you read Little Women yet? Yes, I have./ No, I havent. Has Tina read Treasure Island yet? Yes, she has. She thinks its fantastic. Have you decided which book to write about
2、 yet? Yes, I have. Ive already finished reading it. It was really good.,用法 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。 e.g. Have you had your lunch yet? Yes, I have. Ive just had it. (现在 我不饿了。) 2. 表示动作或状态从过去某一时刻开始,一直延续到现在,而且可能还要继续下去。,现在完成时,e.g. I havent seen her these days. Ive known Bob for three years. Ive b
3、een at this school for over two years.,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,规则动词的过去分词构成与过去式相同,不规则动词的过去分词则需逐个记忆。,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
4、wished wished; stay stayed stayed 2. 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 replied 4. 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、 5. 以不变应万变。如: let let let; put put put; read read read 6. 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 sent 8. 变为以-ought或-aught结尾。如: buy bought bought; bring brought brought; catch caught caught; teach taught
6、taught,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),4. 特殊疑问句: 特殊疑问词 (不是句子主语) + have / has + 主语+过去分词 (+ 其他) 2) 特殊疑问词(是句子主语)+have / has+ 过去分词(+ 其他),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 cleane
7、d 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.,活学活用,1. Write the forms of the past tense and past participle: drink _ _ see _ _ find _ _ leave _ _ tell _ _,drank drunk,saw se
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