Unit 8 Have you read Treasure Island yet？现在完成时 课件(共37张PPT)

(共37张PPT)
现在完成时
The Present Perfect Tense
Studying aims
1.现在完成时的构成
2.现在完成时的主要用法
及相关的时间状语
3. 短暂性动词与时间段的关系
4. have been 与have gone 比较
5.与一般过去时的用法比较
夏天还会远吗
will it still be far in summer
春天已经来了,
Spring has already come,
现在完成时态
Spring
has already come.
一)构成:
have/has+动词过去分词
基本结构
have / has + done
助动词 （可以帮助构成肯定、疑问和否定句）
1.He has cleaned his room.
(写一个一般疑问句）
Has he cleaned his room
2. She has lived in London
for four years. (划线部分提问）
How long has she lived in London
3. He has been to China, ____ ____
（写出反义疑问句部分）
hasn’t he
4. They have come back from work.
(写否定句）
They haven’t come back from work.
(一)表示过去发生的动作或事情对现在的影响和产生的结果.它强调的是过去的动作同现在的联系.常用的时间状语有already, yet, ever, never, just, before等.
现在完成时的主要用法
A: ______ your brother ______ his homework yet (finish)
B: Yes, he ‘s already done it.
Key words
Has finished
yet
already
注意：already 用于肯定句，
yet 用于疑问句和否定句中
A: _______ you ever _______ to the park ( be )
B: No, never.
Key words
Have been
yet
already
ever
never
注意： ever 曾经 用于疑问句中
never 从不 带有否定意义
I ______ just ________ the desk, you can take it to your classroom . (mend )
Key words
have mended
yet
ever
never
just
already
Just 刚刚 与现在完成时连用 一般置句中
Just now 刚才 与一般过去时连用

(二)表示一个从过去开始,一直持续到现在,有可能继续下去的动作或状态.通常和for或since引导的时间状语连用.
Tom ___________ in the factory since he left school ten years ago. (work )
Key words
has worked
since
since 后面带过去时间或有一般过去时的句子
A: How long ______ you ________ in this school (teach )
B: For 6 years.
Key words
have taught
since
for
+ 一段时间
We _______ only ____________ 100 trees so far. (plant)
Key words
have planted
so far
到目前为止
Key words
yet
ever
never
since
for
just
before
already
so far
in the past 10 years
twice
也可以是其他表示次数的词
how long
He has bought the book.
He has bought the book for a week.
He has had the book for a week.
buy
have
come /go/get to
be in
join
be in
be a …member
leave
be away
borrow
keep
begin
be on
finish
be over
die
be dead
reture
be back
She has bought the computer for two years.
had
buy
have/has had
How long have you come to the United States？
been in
come to
have/has been in
buy
have/has had
Ann has gone to China since three months ago.
been in
come to
have/has been in
buy
have/has had
go to
have/has been in
I have left Shanghai for 3 days.
been away for 3 days.
come to
have/has been in
buy
have/has had
go to
have/has been in
got to
have/has been in
join
have/has been in
have/has been a soldier
leave
have/has been away
I have borrowed the dictionary since 3 days ago .
kept
come to
have/has been in
buy
have/has had
go to
have/has been in
got to
have/has been in
join
have/has been in
have/has been a soldier
leave
have/has been away
borrow
have/has kept
The film has begun for 10 minutes.
been on
come to
have/has been in
buy
have/has had
go to
have/has been in
got to
have/has been in
join
have/has been in
have/has been a soldier
leave
have/has been away
borrow
have/has kept
begin
have/has been on
The concert has finished for half an hour.
been over
come to
have/has been in
buy
have/has had
go to
have/has been in
got to
have/has been in
join
have/has been in
have/has been a soldier
leave
have/has been away
borrow
have/has kept
begin
have/has been on
finish
have/has been over
His dog has died for two years .
been dead
come to
have/has been in
buy
have/has had
go to
have/has been in
got to
have/has been in
join
have/has been in
have/has been a soldier
leave
have/has been away
borrow
have/has kept
begin
have/has been on
finish
have/has been over
die
have/has been dead
have been to
have gone to
have been in
去过某地已经回来
常与ever, never,
once,twice,连用
一直留在某地
与for / since连用
用how long 提问
去了某地
还没回来
只用于第三人称
Her sister _____________ Australia,
She left this morning.
has gone to
have/has been to
have/has gone to
have/has been in
去过
常与ever, never,
once,twice,连用
在…
与时间段连用
用how long 提问
去了
说话时某人不在
只用于第三人称
A: How long ____ you _______ China
B: I _________ here for 3 years.
have been
have been in
have/has been to
have/has gone to
have/has been in
去过
常与ever, never,
once,twice,连用
在…
与时间段连用
用how long 提问
去了
说话时某人不在
只用于第三人称
A: _____ you ever ________ the city
B: No , never .
Have been to
与一般过去时的用法比较
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）;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。
上一页
下一页
主菜单
We ____________ each other since childhood .
We ____________ each other when we were young .
know
have known
knew
I ________ him just now .
(see)
I _____ just _____ my pen. (lose)
saw
have
lost
A: When______ you ______ the film
B: I ____ it two months ago. (see)
The writer ________________ several story-books since 5 years ago. (finish)
did
has finished
see
saw
用动词的适当形式填空
1.--______ you _________your pen (mend)
--Yes, I _______.
--When_______ you _______ it
--I __________ it yesterday.
2.--How do you like the film
--I ____________(not see) such a moving film
before.
3.Millie’s sister _______(join) the club last week.
So she _________(be) in the club for nearly
one week.
Have
mended
have
did
mend
mended
haven’t seen
joined
has been
Exercises
4.My father__________(give) up ________(smoke).
He doesn’t _________(smoke) now.
5.The Green family_____________(not come) back
yet from the cinema.
They______(go) to see a film one hour ago.
has given
smoking
smoke
haven’t come
went
6.She has known Sam______ nine years.
(for , never , since)
7.They have______arrived.
(ever , just , yet)
8.Have you_____ ridden a horse
(ever , for , yet)
9.She has known Fred______ they were
at primary school.
(already , just , since)
10.We have not completed the
project_____. (already , for , yet)
for
just
ever
since
yet
Write a passage about travel to use the present perfect tense.
Homework