最新初中现在完成时讲解(完整版)教学讲义ppt课件
合集下载
现在完成时讲解(课堂PPT)
6
现在完成时的基本句型:
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.
7
现在完成时的主要用法
用法1. 表示发生在过去的动作对现在造成的结果或 影响。
(与一般过去时对比,一般过去时强调的是 发生在过去的动作而现在完成时强调的是现在的结果 或影响。)
-- It’s so dark.
--Someone has turned off the light. (有人刚把灯关了,对现在造成的结果是:现在很黑)
-- Are you free?
--I have finished my homework. I am free. (我已经完成了家庭作业,对现在造成的结果是很有空)
4
现在完成时的构成
主语+have (has)+ 过去 分词
上一页
主菜单
5
下一页
例句:
I have already had lunch. Have you had lunch yet? Yes, I have. No, I haven't. I haven't had lunch yet.
He has gone to the library ? 他是去了图书馆。
18
现在完成时标志词
1.在表示“用法2”时,现在完成时常 与since + 过去的时间点,for + 一段时间, so far ,up to now等时间状语连用。
19
1.for + 一段时间
现在完成时的基本句型:
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.
7
现在完成时的主要用法
用法1. 表示发生在过去的动作对现在造成的结果或 影响。
(与一般过去时对比,一般过去时强调的是 发生在过去的动作而现在完成时强调的是现在的结果 或影响。)
-- It’s so dark.
--Someone has turned off the light. (有人刚把灯关了,对现在造成的结果是:现在很黑)
-- Are you free?
--I have finished my homework. I am free. (我已经完成了家庭作业,对现在造成的结果是很有空)
4
现在完成时的构成
主语+have (has)+ 过去 分词
上一页
主菜单
5
下一页
例句:
I have already had lunch. Have you had lunch yet? Yes, I have. No, I haven't. I haven't had lunch yet.
He has gone to the library ? 他是去了图书馆。
18
现在完成时标志词
1.在表示“用法2”时,现在完成时常 与since + 过去的时间点,for + 一段时间, so far ,up to now等时间状语连用。
19
1.for + 一段时间
现在完成时ppt精品课件ppt课件
❖ 8.What time have the factory opened?
did
open
❖ 9.I have gone to Chunhua Middle School twice been to
Exercises
❖ I am an American boy I came to China two years ago. Ihave s_tu_d_ie_d_(study) here for two years. My father often takes(take) me_to__pl_ay_ (play) football on the playground.
Exercises
❖ 1. I h__a_v_e_h_a_d_(have) lunch already. ❖ 2. Has the train_a_r_r_iv_e_d_ (arrive), yet? ❖ 3.Tome _h_a_s_ never_b_e_e_n__to_ (be to ) China. ❖ 4. The twin __h_a_s__just _s_e_e_n_(see) my
❖ have/has been in:表示某人“已在某地停留 一段时间,现仍在那里”,其后常带表示 一段时间的状语。
Exercises
❖ Tom 在哪儿? 他去书店买书了。 -Where is Tom?
-He has gone to the bookshop to buy some books. ❖ 我在北京待了5年了。
eg.1. He had his breakfast at 6:00 He has had his breakfast.
2. When did you come here? I watched the football match on TV at 9:00.
现在完成时课件全
答案及解析:
答案:haven't been
解析:句意表示“自从上个月以来,我还没有去过电影院”,表示从过 去某一时刻到现在为止的动作,用现在完成时,且“have+be动词”表 示状态,故用haven't been。
填空题练习
• 题目1: They ___(live) in this city for ten years.
04
现在完成时的注意事项
现在完成时与一般过去时的区别
总结词
两者都表示过去发生的动作,但侧重 点不同。
示例
I have read the book.(我已经读过 这本书了,现在我知道书的内容了。
)
详细描述
现在完成时强调的是这个动作对现在 的影响或结果,而一般过去时只是单 纯地表示过去某个时间点发生的动作 ,不涉及现在的情况。
填空题练习
答案及解析:
答案:have read
解析:句意表示“我已经读过这本书两次了”,表示从过去某一 时刻到现在为止一直进行的动作,用现在完成时,且“read”表 示阅读,故用have read。
翻译题练习
题目1: 我已经完成了我的作业。(翻译成英文 )
答案:I have finished my homework.
yet
常用于否定句或疑问句,表示某动作还未 完成。例如:“Have you finished your homework yet?”(你作业写完了吗? )
ever
常用于疑问句,表示曾经做过某事。例如 :“Have you ever been to the Great Wall?”(你曾经去过长城吗?)
填空题练习
01
答案解析:
02
答案:have lived
答案:haven't been
解析:句意表示“自从上个月以来,我还没有去过电影院”,表示从过 去某一时刻到现在为止的动作,用现在完成时,且“have+be动词”表 示状态,故用haven't been。
填空题练习
• 题目1: They ___(live) in this city for ten years.
04
现在完成时的注意事项
现在完成时与一般过去时的区别
总结词
两者都表示过去发生的动作,但侧重 点不同。
示例
I have read the book.(我已经读过 这本书了,现在我知道书的内容了。
)
详细描述
现在完成时强调的是这个动作对现在 的影响或结果,而一般过去时只是单 纯地表示过去某个时间点发生的动作 ,不涉及现在的情况。
填空题练习
答案及解析:
答案:have read
解析:句意表示“我已经读过这本书两次了”,表示从过去某一 时刻到现在为止一直进行的动作,用现在完成时,且“read”表 示阅读,故用have read。
翻译题练习
题目1: 我已经完成了我的作业。(翻译成英文 )
答案:I have finished my homework.
yet
常用于否定句或疑问句,表示某动作还未 完成。例如:“Have you finished your homework yet?”(你作业写完了吗? )
ever
常用于疑问句,表示曾经做过某事。例如 :“Have you ever been to the Great Wall?”(你曾经去过长城吗?)
填空题练习
01
答案解析:
02
答案:have lived
初中英语现在完成时态讲解精品ppt课件
• 你已经找到你的书了吗? (find-found) Have you found your book yet?
• 他们在这个城市建了许多房子. (build-built) They have built many buildings in this city.
• Judy还没到达. (arrive-arrived) Judy hasn’t arrived yet.
comb your hair ------ have combed it wash your hands ----- have washed them study for English test ----- have studied for it tell me the truth -----have told you everything visit your grandpa ----- have visited him listen to the English tape ----- have listened to it
Invention newspaper canned food
Date 1610 1823
sewing machine(缝纫机) airplane plastic(塑料)
1851 1903 1907
People have read newspaper since 1610 . People have read newspaper for about 400 years.
采用PP管及配件:根据给水设计图配置好PP管及配件,用管件在 管材垂 直角切 断管材 ,边剪 边旋转 ,以保 证切口 面的圆 度,保 持熔接 部位干 净无污 物
Father: Tell your sister to buy some milk, John.
• 他们在这个城市建了许多房子. (build-built) They have built many buildings in this city.
• Judy还没到达. (arrive-arrived) Judy hasn’t arrived yet.
comb your hair ------ have combed it wash your hands ----- have washed them study for English test ----- have studied for it tell me the truth -----have told you everything visit your grandpa ----- have visited him listen to the English tape ----- have listened to it
Invention newspaper canned food
Date 1610 1823
sewing machine(缝纫机) airplane plastic(塑料)
1851 1903 1907
People have read newspaper since 1610 . People have read newspaper for about 400 years.
采用PP管及配件:根据给水设计图配置好PP管及配件,用管件在 管材垂 直角切 断管材 ,边剪 边旋转 ,以保 证切口 面的圆 度,保 持熔接 部位干 净无污 物
Father: Tell your sister to buy some milk, John.
初中英语现在完成时讲解全精品课件
I have bought the book. I have bought the book for five days.
I have had the book for five days. I have had the book since five days ago.
Tips:buy 这个动作 从“开始发生”到 “结束/终止”, 几
8. You are late. The film ____for 10 minutes. A. has begun B. has been on C. has finished D. has started
9. How long has she _____the newspaper? A. borrow B. lend C. kept D. buy
finish 这些动词不能和 for …. Since……连用 与for和since连用时,要把它们变成相应的延续性动词
--------------------------------------------------------------------------------
(buy买了…)
had
since(自从)+时间点
•I have studied English for ten years.= I have studied English since ten years ago.
注 意 : 完 成 时 不 能 单 独 和 时 间 状 语 (two hours,three days,last week,four hours ago) 连 用 , 必 须 加 上 for ,since.
性
7. The film began 30 minutes ago.
I have had the book for five days. I have had the book since five days ago.
Tips:buy 这个动作 从“开始发生”到 “结束/终止”, 几
8. You are late. The film ____for 10 minutes. A. has begun B. has been on C. has finished D. has started
9. How long has she _____the newspaper? A. borrow B. lend C. kept D. buy
finish 这些动词不能和 for …. Since……连用 与for和since连用时,要把它们变成相应的延续性动词
--------------------------------------------------------------------------------
(buy买了…)
had
since(自从)+时间点
•I have studied English for ten years.= I have studied English since ten years ago.
注 意 : 完 成 时 不 能 单 独 和 时 间 状 语 (two hours,three days,last week,four hours ago) 连 用 , 必 须 加 上 for ,since.
性
7. The film began 30 minutes ago.
初中英语现在完成时课件(共62张PPT)
speak-spoke-spoken
freeze-froze-frozen
ride-rode-ridden
get-got-gotten (got) forget-forgot-forgotten (forgot) 特殊:
am/is-was-been are-were-been,
do (does)-did-done go-went-gone
I have already done my homework. 否定句: I haven’t done my homework yet. 一般疑问句: Have you done your homework yet?
3. ever在现在完成时中的用法
肯定句/疑问句 : 句中 “曾经” I’ve ever been to Beijing. Have you ever been to Beijing?
catch,teach
ABB(含规则动词)
1.另有一些其它形式的变化。
have (has)-had-had lose-lost-lost feel-felt-felt stand-stood-stood
leave-left-left make-made-made spell-spelt-spelt
ABA
有些动词的过去分词与原形是一样的:
run-ran-run come-came-come become-became-become overcome-overcame-overcome
ABB(含规则动词)
原型 过去式 过去分词
例词
-eep -ept -ept
keep,sweep,sleep
-ell -old -old
加-ed 结尾是“辅音字母+y”
初中英语_现在完成时_解析全套PPT
句子中如有过去时的时间副词(如 yesterday, last, week, in 1960)时, 不能使用现在完成时,要用过去时
(错)Tom has written a letter to his parents last night. (对)Tom wrote a letter to his parents last night.
He has gone to Shanghai.
他已经去上海了 [也许刚动身出发,也许已经到了,也许还在 路上,反正他人不在这里] He has been in Shanghai for 10 years.
他呆在上海迄今为止已经10年了 [现在还在上海没有离开呢]
含由辨
义时析
上 的 差 别
态 导 致 的
He has learned English since 2001. --从2001年开始学的,现在还在继续学着呢
现在完成时
past
一般过去时
now
future
一般过去时表示的是纯粹在过去发生的事情
现在完成时表示的是在过去某个时间开始并持续到现在的动作/状态,或者发生在 过去却对现在造成的影响
现在完成时与一般过去时的比较
这 些 句 子
He lived in Shanghai for 10 years.
以前他在上海住过10年 [现在不在上海了]
现在完成时和现在完成进行时的区别
• 共同点:都可以表示动作发生在过去持续到现在并将有可 能继续下去
• 区别: • 1. 现在完成时表已完成用法时常常不与表示一段时间的
状语连用,现在完成进行时强调动作的持续性
注意:并非有for 作为时间状语的句子都用现在完成时
I worked here for more than twenty years. (我现在已不在这里工作。)
(错)Tom has written a letter to his parents last night. (对)Tom wrote a letter to his parents last night.
He has gone to Shanghai.
他已经去上海了 [也许刚动身出发,也许已经到了,也许还在 路上,反正他人不在这里] He has been in Shanghai for 10 years.
他呆在上海迄今为止已经10年了 [现在还在上海没有离开呢]
含由辨
义时析
上 的 差 别
态 导 致 的
He has learned English since 2001. --从2001年开始学的,现在还在继续学着呢
现在完成时
past
一般过去时
now
future
一般过去时表示的是纯粹在过去发生的事情
现在完成时表示的是在过去某个时间开始并持续到现在的动作/状态,或者发生在 过去却对现在造成的影响
现在完成时与一般过去时的比较
这 些 句 子
He lived in Shanghai for 10 years.
以前他在上海住过10年 [现在不在上海了]
现在完成时和现在完成进行时的区别
• 共同点:都可以表示动作发生在过去持续到现在并将有可 能继续下去
• 区别: • 1. 现在完成时表已完成用法时常常不与表示一段时间的
状语连用,现在完成进行时强调动作的持续性
注意:并非有for 作为时间状语的句子都用现在完成时
I worked here for more than twenty years. (我现在已不在这里工作。)
最新初中现在完成时讲解(完整版)教学讲义PPT课件
疑难点
I worked here for more than twenty years. (我现在已经不在这里工作了)
I have worked here for more than twenty years. (现在我仍在这里工作)
注:并非所有for作为时间状语的句子都用现在完成时 搞清一般过去时和现在完成时的区别
5. —Is Benny here? —No, he _h_a_s_g_o_n_e_t_o_ the school library. He left five minutes ago.
• 9. He ________ (go) to school on foot every day. goes
• 10.____ you ______ (find) your science book yet? have, • 11. If it ____ (be) fine tomorrow, I'll go with you. found
She has taught English since he came here.
for: (长达)
for+ 时间段
He has kept the book for 2 weeks.
用for 或since填空
1. Mr. Brown has had his TV __fo_r___ 15 years. 2. I’ve taken driving lessons __s_in_c_e__last month. 3. My sister has had her cell phone __f_o_r__a month . 4. My friends haven’t visited me __s_in_c_e_few days ago. 5. We haven’t used our car __fo_r__ a long time . 6. She hasn’t had a good cup of coffee __fo_r__years. 7. Tom has worn glasses __s_in_c_e__he was 7 years old.
现在完成时(上课用)ppt课件
15. give _G_iv_e_n___
16. get ___g_ot_te_n___
17. knowK_n_o_w_n___ 19. writeW__ri_tt_en___
18. open _o_p_e_ne_d__ 20. forget f_or_g_o_tt_en___
最新版整理ppt
10
二) 含义:
Yes, S+have/has.
No, S+have/hasn’t.
最新版整理ppt
15
(改为否定句和一般疑问句并肯否回答) I have seen him since his wedding day.
→Have you seen him since his wedding day?
→I haven’t seen him since his wedding day .
Eg. I have already done my homework. 否定句: I haven’t done my homework yet. 一般疑问句: Have you done your homework yet?
最新版整理ppt
21
3. ever在现在完成时中的用法
肯定句/疑问句 : 句中 “曾经” Eg. I’ve ever been to Beijinen to,have / has gone to, have / has been in的用法区别
1 “ Have /has been to+地名 ”表示曾经去过某地,说话时已
经回到说话地点,常与once 、twice、ever、never 等时间连
用。
What have they just done?
初中语法——现在完成时-课件(共75张PPT)
1、规则变化(过去分词与过去时变化规则一样)
(1)、一般动词,在词尾直接加“ ed ”。 work---worked---worked visit---visited---visited
(2)、以“ e ”结尾的动词,只在词尾加 “ d ”。
live---lived
(3)、以“辅音字母 + y ”结尾的动词,将 “y” 变为 “i”,
3.The film has been on __f_o_r__ 20 minutes. 4.Mr Green has worked here _s_in_c_e__ he came to China.
5.His grandpa has been dead __fo__r __ several years.
肯定句: “己经”
I’ve already had breakfast. (常见) = I’ve had breakfast already.
一般疑问句: 句末(表示惊讶的语气) “难道”
Have you had breakfast already? (表示强调)
(2) yet
否定句:句末 “还(没)” I haven’t had breakfast yet.
You have planted all the trees. I have planted all the trees. He/she has planted all the trees. They have planted all the trees.
主语若是第三人称单数助动词用 has
过去分词
12. Tom has worn glasses _s_i_n_ce___he was 7 years old.
borrow arrive/come
(1)、一般动词,在词尾直接加“ ed ”。 work---worked---worked visit---visited---visited
(2)、以“ e ”结尾的动词,只在词尾加 “ d ”。
live---lived
(3)、以“辅音字母 + y ”结尾的动词,将 “y” 变为 “i”,
3.The film has been on __f_o_r__ 20 minutes. 4.Mr Green has worked here _s_in_c_e__ he came to China.
5.His grandpa has been dead __fo__r __ several years.
肯定句: “己经”
I’ve already had breakfast. (常见) = I’ve had breakfast already.
一般疑问句: 句末(表示惊讶的语气) “难道”
Have you had breakfast already? (表示强调)
(2) yet
否定句:句末 “还(没)” I haven’t had breakfast yet.
You have planted all the trees. I have planted all the trees. He/she has planted all the trees. They have planted all the trees.
主语若是第三人称单数助动词用 has
过去分词
12. Tom has worn glasses _s_i_n_ce___he was 7 years old.
borrow arrive/come
《现在完成时详解》课件
翻译题练习
翻译题1:我已经完成了 作业。
翻译题2:他已经看过这 部电影。
翻译题3:她已经吃过午 饭。
翻译题4:他们已经去过 那个地方。
写作题练习
描述过去发生的事件对现在的影响 描述过去完成的动作对现在的影响 描述过去持续的动作对现在的影响 描述过去完成的动作对将来的影响
YOUR LOGO
THANK YOU
现在完成时通常与表示一段时间的状语连 用,如"for+一段时间"、"since+时间点" 等,一般过去时通常与表示时间点的状语 连用,如"yesterday"、"last week"等。
02
现在完成时通常用于描述经常发生的动作或状 态,一般过去时通常用于描述偶尔发生的动作
或状态。
04
语义上的区别
现在完成时:强 调过去发生的动 作对现在的影响 或结果
用于描述过去发 生的动作或状态 ,对现在产生影 响
用于描述过去发 生的动作或状态 ,对现在产生影 响,强调动作或 状态的完成
现在完成时与一般
04
过去时的区别
用法上的区别
01
现在完成时表示过去发生的动作对现在产生的 影响或结果,一般过去时只表示过去发生的动 作。
03
现在完成时通常用于描述已经完成的动作或状 态,一般过去时通常用于描述已经结束的动作 或状态。
一般过去时:只 表示过去发生的 动作,不涉及对 现在的影响或结 果
现在完成时:常 用于描述已经完 成的动作或状态
一般过去时:常 用于描述过去发 生的动作或状态, 不涉及是否完成
语境上的区别
现在完成时:强调过去发生的动作对现在的影响或结果
初中英语语法现在完成时精讲PPT
• 2. We went to the USA last Monday. Today is Monday . We h_a_v_e_s_t_a_y_ed_ (stay) in the USA since last Monday.
since and for
The woman has worked at this school for 2 years.( since two years ago)
4. 现在完成时常常与表示频度的时间状语 连用,如often, sometimes, ever, never, twice, on several occasion等:
Have you ever been to Beijing? I have never heard of Bunny. I have used this pen only three times. George has met that gentleman on several occasions.
__f_o_r __two days
__s_in_c_e__1997
__si_n_ce__yesterday
__fo_r___two weeks
afternoon
___s_in_c_e _three years
__si_n_ce__I came here ago
__si_n_ce__last Sunday __s_in_c_e__ last month
for + 时间段 for 2 years/a long time
since+时间点 since 2 years ago
since 1998 since she came to the school)
一、用for和since填空。
since and for
The woman has worked at this school for 2 years.( since two years ago)
4. 现在完成时常常与表示频度的时间状语 连用,如often, sometimes, ever, never, twice, on several occasion等:
Have you ever been to Beijing? I have never heard of Bunny. I have used this pen only three times. George has met that gentleman on several occasions.
__f_o_r __two days
__s_in_c_e__1997
__si_n_ce__yesterday
__fo_r___two weeks
afternoon
___s_in_c_e _three years
__si_n_ce__I came here ago
__si_n_ce__last Sunday __s_in_c_e__ last month
for + 时间段 for 2 years/a long time
since+时间点 since 2 years ago
since 1998 since she came to the school)
一、用for和since填空。
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
辨析 have been to和 have gone to
My father has gone to Shanghai for a meeting. 他(已经)去了上海。
My father has been to Shanghai for a meeting. 他(曾经)去了上海。
She has been to China . 她(曾经)去过中国。(人已经回来了)
1.—Where is your brother? —He __h_as__g_on_e__to___ the shop. He’ll be back soon.
2. — __H_a_v_e_ you ever _b_e_e_n__to___ to America? —Yes, I _h_av_e__be_e_n__to__ New York twice.
长 的 时 间 隧 道,袅
初中现在完成时讲解(完整版)
Present Perfect Tense
现在完成时
past
present(now)
future
现在完成时的结构 主语 + have/ has + 过去分词(pp)
助动词,无意义
Winter has already come, will it still be far in spring ?
进 入 夏 天 ,少 不了一 个热字 当头, 电扇空 调陆续 登场, 每逢此 时,总 会想起 那 一 把 蒲 扇 。蒲扇 ,是记 忆中的 农村, 夏季经 常用的 一件物 品。 记 忆 中 的故 乡 , 每 逢 进 入夏天 ,集市 上最常 见的便 是蒲扇 、凉席 ,不论 男女老 少,个 个手持 一 把 , 忽 闪 忽闪个 不停, 嘴里叨 叨着“ 怎么这 么热” ,于是 三五成 群,聚 在大树 下 , 或 站 着 ,或随 即坐在 石头上 ,手持 那把扇 子,边 唠嗑边 乘凉。 孩子们 却在周 围 跑 跑 跳 跳 ,热得 满头大 汗,不 时听到 “强子 ,别跑 了,快 来我给 你扇扇 ”。孩 子 们 才 不 听 这一套 ,跑个 没完, 直到累 气喘吁 吁,这 才一跑 一踮地 围过了 ,这时 母 亲总是 ,好似 生气的 样子, 边扇边 训,“ 你看热 的,跑 什么? ”此时 这把蒲 扇, 是 那 么 凉 快 ,那么 的温馨 幸福, 有母亲 的味道 ! 蒲 扇 是 中 国传 统工艺 品,在 我 国 已 有 三 千年多 年的历 史。取 材于棕 榈树, 制作简 单,方 便携带 ,且蒲 扇的表 面 光 滑 , 因 而,古 人常会 在上面 作画。 古有棕 扇、葵 扇、蒲 扇、蕉 扇诸名 ,实即 今 日 的 蒲 扇 ,江浙 称之为 芭蕉扇 。六七 十年代 ,人们 最常用 的就是 这种, 似圆非 圆 , 轻 巧 又 便宜的 蒲扇。 蒲 扇 流 传 至今, 我的记 忆中, 它跨越 了半个 世纪, 也 走 过 了 我 们的半 个人生 的轨迹 ,携带 着特有 的念想 ,一年 年,一 天天, 流向长
She has gone to China last week. 上周她去了上海 。(人可能回来了也可能没回来)
have been to someplace. 曾经去过某地,已经回来. has gone to someplace.某人去了某地,还没有回来.
用have/has been to, have/has gone to填空:
疑难点
I worked here for more than twenty years. (我现在已经不在这里工作了)
I have worked here for more than twenty years. (现在我仍在这里工作)
注:并非所有foΒιβλιοθήκη 作为时间状语的句子都用现在完成时 搞清一般过去时和现在完成时的区别
She has taught English since he came here.
for: (长达)
for+ 时间段
He has kept the book for 2 weeks.
用for 或since填空
1. Mr. Brown has had his TV __fo_r___ 15 years. 2. I’ve taken driving lessons __s_in_c_e__last month. 3. My sister has had her cell phone __f_o_r__a month . 4. My friends haven’t visited me __s_in_c_e_few days ago. 5. We haven’t used our car __fo_r__ a long time . 6. She hasn’t had a good cup of coffee __fo_r__years. 7. Tom has worn glasses __s_in_c_e__he was 7 years old.
2) 表示过去发生的动作,强调结果或对现在的影响。
Someone has broken the window. (窗户现在是坏的) I have already lost the key. (我现在没有钥匙) I haven’t read that book yet . (不了解书的内容) I have just cleaned my hands. (手是干净的)
常与already(已经), yet(已经), just(刚刚),ever(曾经) 等词连用.
already: 常用于肯定句中. yet: 常用于否定句,疑问句尾.
3) 表示从过去开始并持续到现在的动作或状态,常与 包括现在在内的一段时间的状语连用。 She has learned English for 5 years.
He has lived in Beijing since 5 years ago.
since , for 的用法:
since: (自…以来)
1)since+时间点
Take notes
He has stayed here since 5 o’clock. 2)since+ 时间段+ ago
He has stayed here since 5 hours ago. 3)since+ 从句