1、用法用法1. 表示过去发生或已经完成的某一动作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。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. (现在现在 我不饿了。我不饿了。)2. 表示动作或状态从过去某一时刻开始，表示动作或状态从过去某一时刻开始，一直延续到现在，而且可能还要继续一直延续到现在，而且可能还要继续下去。下去。e.g. I havent seen her these days. Ive known Bob for three years. Ive been at t
2、his school for over two years. 时间状语时间状语already, yet, just, ever, never, before构成构成现在完成时是由现在完成时是由“助动词助动词have / has+ 动动词的过去分词词的过去分词”构成的，规则动词的过构成的，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。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。我们对它们作了一变化并不完全相同。我们对它们作了一个大致的分类。个大致的分类。 (注：例子中单词的变注：
3、例子中单词的变化顺序为：动词原形化顺序为：动词原形 动词的过去式动词的过去式 动词的过去分词动词的过去分词)一、过去式和过去分词的变化相同一、过去式和过去分词的变化相同规则变化规则变化：1. 一般在动词词尾直接加一般在动词词尾直接加ed。如：。如： pick picked picked; wish wished wished; stay stayed stayed2. 以不发音的以不发音的e结尾的动词后面加结尾的动词后面加d。如：。如：like liked liked; hope hoped hoped; phone phoned phoned3. 以以“辅音字母辅音字母 + y”结尾的动词，
4、变结尾的动词，变y为为i，再加再加-ed。如：。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，再加词，要双写辅音字母，再加-ed。如：。如：stop stopped stopped; clap clapped clapped不规则变化：不规则变化：5. 以不变应万变以不变应万变。如：。如： let let let; put put put; read read read6. 若中间有双写若中间有双写e，则去掉
5、一个，则去掉一个e，单词，单词末尾再加末尾再加t。如：。如： feel felt felt; keep kept kept; sleep slept slept7. 结尾的字母结尾的字母d变变t。如：。如： lend lent lent; build built built; send sent sent8. 变为以变为以-ought或或-aught结尾结尾。如：。如： buy bought bought; bring brought brought; catch caught caught; teach taught taught句式句式1. 肯定句：主语肯定句：主语 + have / ha
6、s + 过去分词过去分词 (+ 其他其他)2. 否定句：主语否定句：主语 + have / has + not + 过去过去 分词分词(+ 其他其他)3. 一般疑问句：一般疑问句：have/ has + 主语主语 + 过去过去 分词分词(+ 其他其他)4. 特殊疑问句特殊疑问句：1) 特殊疑问词特殊疑问词 (不是句子主语不是句子主语) + have / has + 主语主语+过去分词过去分词 (+ 其他其他)2) 特殊疑问词特殊疑问词(是句子主语是句子主语)+have / has+ 过去分词过去分词(+ 其他其他)already和和yet都可以作为现在完成时的标都可以作为现在完成时的标志词，但
7、它们的用法不同。志词，但它们的用法不同。already一般用于肯定句中一般用于肯定句中。如：。如： We have already cleaned up our classroom. 注意：注意：already用于疑问句中时通常表用于疑问句中时通常表示惊奇示惊奇。如：。如： Have you finished your homework already? I cant believe it.yet一般用于疑问句和否定句中一般用于疑问句和否定句中。如：。如： Have you seen her yet? The bus hasnt come yet.1. Write the forms of t
8、he past tense and past participle: drink _ _ see _ _ find _ _ leave _ _ tell _ _drank drunksaw seenfound foundleft lefttold told Why is Mr. Yang still in the teachers office? Maybe he _ his work yet. A. doesnt finish B. hasnt finished C. havent finishedB 1 Use the words in brackets to complete the c
9、onversations.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 some teaHave you found it3. A: Do you know when Tom is leaving? B: _. (already/ leave) A: When _? (leave) B: This morning.4. A: Is
10、 your sister going to the movies with us tonight? B: No. _. (already/ see the film)He has already leftdid he leaveShe has already seen the film5. A: What do your parents think about our plan? B: I _. (not/ tell them/yet)havent told them yet( )【2013广西贵港】 Do you know the movie Lost in Thailand? Yes. I
11、 _ it twice. Its funny. A. saw B. see C. have seen D. will see C( )【2013黑龙江牡丹江】 Lunch? No, thanks. I_. A. will eat B. am eating C. have eaten( )【2013 湖北黄冈】 Where is Tom? We cant find him anywhere. Perhaps he _ home. A. has come B. is going C. went D. was goingCA1.Where is John? He _ the science lab.
12、 A. has gone to B. has been to C. went to2.Where is my sister, mum?She _ to the library. She will be back soon. A. has been B. is going C. has gone D. will goAC3.May I speak to Lin Tao? Sorry, he is not in. He _ to Changsha. A. has been B. has gone C. wentB一一 翻译下列句子：翻译下列句子：1.我已经读完它了。我已经读完它了。2.这本书非常棒，我对它爱不释手。这本书非常棒，我对它爱不释手。3.读读书报告书报告两两周后周后必须交。必须交。4.鲁滨逊漂流记是本经典之作。鲁滨逊漂流记是本经典之作。I have already finished reading it.This book is really good, so I couldnt put it down.The book report is due in two weeks. Robinson Crusoe is a classic book.二二 选选 择择 题题
