Unit 8 Have you read Treasure Island yet?现在完成时（课件）

(共18张PPT)
the Present Perfect Tense
导入课题
Can I watch TV, mom
I have finished my homework.
基本用法（一）
表示过去或已完成的动作对现在造成的影响或产生的结果。
如：I have cleaned my room.
(我已经打扫了我的房间。→房间现在干净了。)
基本用法（二）
We like English.
We have learnt many words.
表示从过去开始一直持续到现在的动作或状态，常与for或since连用。
如：We have learnt English for 2 years.
（我们已经学习英语两年了。）
1.already 已经（肯定句，句中）
2.yet 还 （否定句及疑问句，句末）
3.ever 曾经
7.so far 到目前为止
8.for+一段时间 （→for 2 years）
4.never 从未
5.just 刚刚
6.before 以前
9. since+过去的时间点 （→since 2 years ago）
10.since+一般过去时从句（→…since he came here.）
现在完成时的标志词
A: Have you _______ been to France
B: No, I’ve _______ been to any European
countries, but Michael has. He has ____
come back from France. He likes it very
much.
A: Have you seen him _____
B: Yes, I have _______ seen him.
现学活用
just already yet ever never
ever
never
just
yet
already
现在完成时的构成：
助动词 have / has +动词的过去分词
1.I have had my lunch.
2.They have lived here for 10 years.
3. She has seen the film.
4. He has read the book.
Can you guess？
过去分词
（一）规则变化
（原形） （过去式） （过去分词）
1.work → worked → worked
2.study → studied → studied
3.live → lived → lived
4.stop → stopped → stopped
（二）不规则变化
1.go → went → gone
2.come → came → come
3.see → saw → seen
4.take → took → taken
5.give → gave → given
6.do/does → did → done
【中考链接】
1.区分 have been to （曾经到过某地）
have gone to （已经去某地了）
→如：※ Where is Jim
He has gone home .
他已经回家了。（人不在这儿）
※I have been to America twice .
我去过美国两次。（曾去过，已回来）
现在完成时的句式
肯定句 否定句 疑问句 答语
I have worked. I have not worked. (=haven’t)
Have you worked
Yes,I have.
No,I haven’t.
She has worked. She has not worked. (=hasn’t) Has she worked Yes,she has.
No,she hasn’t.
1. They have found (找到) the dog.
(否定句)→They the dog.
2. Tom has seen the film.
(疑问句)→ Tom the film
Exercise One
haven’t
found
Has
seen
Exercise Two
1. Jane ______ already ______ (visit) the museum.
2. ______ you ever ______ (do) some washing
No，I _______.
3. Mr. Wu _______ ______ (not come) back
form his hometown yet.
4. Great changes _______________ (take) place in China.
5. ________ Jim __________ (help) some poor children since 1998
Yes, he _______.
has
visited
Have
done
haven’t
hasn’t
come
have taken
Has
helped
has
Exercise Three
Lily, for 2 years, live
they, since 2000, have
Lily has lived in Beijing
for 2 years.
They have had a car
since 2000.
特别提示
for + 时间段
since + 过去时间点/从句
（使用持续性动词）
如：I have kept the book for 2 weeks. ( 已经借了)
(“borrow”是瞬间动词，不能与表示一段时间的状语连用。）
判断正误：
1.I have bought this computer for two years.( )
2. I have had this computer for two years.( )
F
T
熟记表格
短暂性V. 持续性V.
①come →be in
②leave →be away
③buy →have
④borrow →keep
⑤die →be dead
⑥join →be in
⑦begin →be on
【中考链接】
Maria saw the film yesterday.（动作结束了）
Maria has already seen the film.
（已知晓电影内容）
一般过去时→表示动作发生在过去，
强调的是过去的情况.
现在完成时→强调过去发生的动作对
现在的影响.
请观察和比较
1.Sanya is a nice city. I _____ there twice.
have gone B. have been C. have been to
2.Mary ______ in China five years ago. She ______ for
five years.
worked, worked B. have worked, worked
C. worked, have worked
3.They ______ this big house since they moved here.
A. have had B. have bought C. bought
挑
战
中
考
题