现在完成时(习题2)
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现在完成时
一、构成:
肯定式:主语 + 助动词have/has + 动词的过去分词.
疑问式:助动词Have/Has + 主语 + 动词的过去分词?
否定式: 主语 + 助动词have/has + not + 动词的过去分词.
过去分词规则变化:
a)一般情况下,直接加ed, (work---worked,water---watered, finish---finished等;)
b)以“辅音字母+ y”结尾的动词, 把y 变成i 再加ed, (carry-- -carried study---studied等;)
c)以辅+元+辅结尾且中读的动词,要双写最后一个辅音字母,再加ed。 (stop---stopped,shop---shopped)
d)以不发音的e结尾的动词,只加d (
过去分词不规则变化表:
二、用法:
用法一:表示过去(已经、曾经或从未)发生的某一动作对现在造成的影响或结果。
标志词: ①already, ②never, ③ever, ④just, ⑤yet, ⑥before,
⑦once/twice/数字+ times
例: I have cleaned my room. 我已打扫了房间(房间现在是干净的,不需要打扫了)
They have left. --他们已经离开了,也就是说现在他们人不在这里
I have never had a car (我从未有过汽车。)
I have been there twice.
a)already 往往用于肯定句,用在疑问句时表示强 调或加强语气;yet 用于否定句和疑问句。
• He has already left here. 他已经离开这里了。
• Has he already left here? 他(真的)已经离开这里了吗?(表示加强语气)
• My teachers haven’t had breakfast yet. 我的老师们还没有吃早饭。
• Have you written to your parents yet? 你已经给你父母写过信了吗?
b) never 是否定词,表示“从来没有”,而ever 表示“曾经”
• We have never been to the Great Wall. 我们从来没有去过长城。
• Have you ever been to Canada? 你们曾经去过加拿大吗?
c) just用于句中, 表示“刚刚”
• I’ve just had breakfast. 我刚吃完早饭。
• What have they just done? 他们刚刚做了什么?
d) before用于句末, 表示“以前”
• I’ve seen it before. 我以前见过它。
★ has gone to, has been to, has been in 的区别:
1. have/has gone to 去了某地(还在某地没回来)
---Where is your father? 你爸爸在哪里?
---He has gone to Shanghai. 他去上海了。
2. have/has been to 曾经去过(已回,已不在去过的地方) +次数(once/twice/ 数字+times)
My father has been to Shanghai 3 times. 我爸爸去过上海3次。
画线提问:________________ has your father been to Shanghai?
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3. have/has been in 待了多久(去了,现在仍在所待的地方)+ for + 时间段/
+ since + 时间点
My father has been in Shanghai for two months/ since two months ago. 我爸已经在上海待了两个月了。
画线提问:_______________has your father been in Shanghai?
▲注意:注意遇到四个地点副词要去掉to/in, 这四个地点副词是:here ,there ,home ,abroad
用法二:表示过去已经开始, 并一直持续到现在的动作或状态。
标志词:⑦up to now, ⑧so far, ⑨for +时间段 ⑩since+时间点
I have learnt English for more than ten years.我已经学了10多年的英语。
She has swum since half an hour ago.我已经游泳了半个小时
a) for +一段时间
Eg. I have been here for 5 weeks. 我在这里5周了。
He’s studied English for 3 years. 他学习英语3年了。
b) since +(表示过去某一时间的)时间点/单词/词组/ 从句(一般过去时)
Eg. I have been here since 2000. 我自从2000年开始在这里。
I have been here since 5 years ago. 我自从5年前就在这里。
I have been here since I graduated in 2000. 我自从2000年毕业就在这里。
★为了表述这种意思,我们常用相应的延续性动词 来代替短暂性动词。
become →be, begin→ have , borrow → keep, buy → have,
go out → be out come (go, arrive, get) →be in die→ be dead,
finish→ be over, join→ be in …(be a member of … ) leave→ be away ( from…),
open→ be open close→ be closed
三、与一般过去时的用法比较
1现在完成时和一般过去时都是说过去的事情,但现在完成时注意的不是事情本身,而是强调事情与现在保持的某种密切联系(如现在的结果,影响,一直延续到现在等),不与表示过去的时间连用; 而一般过去时,则只讲述发生在过去的动作和事情与现在没有关系,常与表示过去的时间连用。
eg:He has bought an English-Chinese dictionary. 他已经买了一本英汉字典。
He bought an English-Chinese dictionary. 他曾买过一本英汉字典。
第一句用现在完成时时态,想表达意为:“He bought an English-Chinese dictionary. And he still has it”
“过去他买了一本英汉字典,现在他还有这本字典” 。
第二句用过去时只叙述过去他买过一本英汉字典这一事实,至于现在他是否有这本字典并未强
调说明。
2.常与一般过去时连用的典型的表示过去时间的状语:
yesterday(昨天), the day before yesterday(前天),
just now(刚才), 时间+ ago, last +时间 等;
eg: The plane took off ten minutes ago.
We finished our task last week .
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现在完成时练习题
一. 单项选择
1. I have been living here _____ 1999.
A. for B. after C. in D. since
2._____ have you been playing the guitar? For 5 years.
A. How soon B. How long C. How far D. How often
3.______ may I keep these books? For two weeks.
A. How often B. How far C. How long D. How soon
4.______ have you been here? I’ve been here for months.
A. How long B. How often C. How much D. How many
5. The boy ______TV all morning.
A. has watched B. had watched C. has been watching D. watched
6. How long _____ you _____ stamps? Since two years ago.
A. have, collected B. did, collect C. have , been collecting D. are, collecting
7.They are still working in the fields. They ______ for two hours.
A. was working B. has been working C. worked D. are working
8.He looks tired. Oh , he ____ for three hours.
A. have been skating B. have been skated C. has been skating D. has been skated
9. He ______ it for two hours, and he is still watching now.
A. has been B. watching C. has been watching D. is watching
10. The famous writer _____ one new book in the past two years.
A. is writing B. was writing C. wrote D. has written
11.Harry Potter is a very nice film . I_______ it twice.