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(共26张PPT)
八年级下册
Unit 1 Past and present
Grammar
能够在语境中正确使用现在完成时。
At the end of this lesson, you will be able to
能掌握现在完成时的基本结构、用法，以及动词过去分词的变化规则；
transport /'tr nsp t/ n. 交通运输系统
recently /'ri sntli/ adv. 最近
already / l'redi/ adv. 已经，早已
yet /jet/ adv. 尚（未），还
reporter /r 'p t (r)/ n. 记者
line /la n/ n. （交通）路线；线（条）；行列
New words
Shenzhen (1)_______________from a fishing village to a top high-tech city.
Shenzhen (2)_____________ workers from across the world.
It (3)_________ to become an important centre for technology industries in the world and is home to many tech giants.
It (4)__________an award from UNESCO for
being a role model in encouraging reading among
the public.
has developed
has attracted
has risen
has won
has won has developed has attracted has risen
Q: What changes have you seen in Shenzhen
Review
主语+_________+________
have/has
the past participles of verbs
过去分词
Present perfect tense
现在完成时
done
Read and find out more about present perfect tense.
Presentation
I've just found out many things about Shenzhen from my uncle.
He's lived there since he finished college.
I have
you have
we have
they have
he has
she has
it has
________
________
________
________
________
________
________
she's
l've
you've
we've
they've
he's
it's
Short forms
Presentation
have/has + done
Read and find .
过去分词
Presentation
Read and find .
过去分词规则变化：
大部分动词后面
以e结尾的动词
以辅音字母加y结尾的动词
以辅音字母结尾的重读闭音节动词
Presentation
Read and find .
过去分词不规则变化：
保持不变
元音有变化
辅音有变化
元音、辅音均有变化
特殊变化
When to use the present perfect tense
He has lived here since he came to Nanjing.
自从来到南京，他就一直住在这里。
present
past
We use the present perfect tense to talk about:
an action that started in the past and continues to the present; （从过去持续到现在的动作或状态）;
since he came
to Nanjing
has lived there
He has lost his mobile phone.
他的手机丢了。
When to use the present perfect tense
present
past
an action that happened in the past and has a connection with the ______________ (past, present);
（动作发生在过去但对现在有一定的影响）
present
lost
He doesn’t have
a phone now.
Presentation
(言下之意:他现在无法使用手机。)
I have been to Beijing many times.
我去过北京很多次了。
When to use the present perfect tense
how many times an action has happened up to ______________(the present, some point in the future).
（表示某个动作从过去到现在发生的次数）
the present
present
past
Presentation
主语+have/has + done
主语+have/has+ not + done
现在完成时句式结构
否定句
肯定句
Presentation
Have/Has + 主语+ done...
Yes, 主语+ have/has.
No, 主语 + haven’t/hasn’t.
现在完成时句式结构
一般疑问句
Presentation
has changed
has
turned
has improved
have
moved
built
haven’t visited
Millie is making notes about the changes in Sunshine Town. Complete her notes with the correct forms of the verbs in bracket.
时间标志词：现在完成时常和already、ever、just、never、recently、yet等副词以及since、for引导的时间状语连用。
时间标志词
already 常用于肯定句，意为“已经”，句中(助后实前)/句末。
I have already finished my homework. 我已经做完作业了。
yet 常用于否定句和疑问句，意为“还（没）”。
He hasn’t come yet. 他还没来。
ever 常用于肯定句和疑问句，意为“曾经”。
Have you ever been to Shenzhen 你曾经去过深圳吗？
never 常用于否定句，意为“从未”。
She has never eaten sushi. 她从没吃过寿司。
时间标志词
before 意为“以前”。
I have seen this movie before. 我以前看过这部电影。
just 常用于肯定句，意为“刚刚”。
He has just left. 他刚走。
表示“持续到现在”的标志词：
recently / lately 意为“最近 ”
I have been very busy recently.
我最近一直很忙。
over / in the (past / last) years “在(过去的)这几年间”
Great changes have taken place in the past few years. 过去几年发生了巨大变化。
—I’ve _____ finished the English homework. What about you
—I finished it ____too.
just now; just B. just; just C. just now; just now D. just; just now
表示“持续到现在”的标志词：
since + 过去时间点/一般过去时句子, 意为“自从…”
I have lived here since 2020. 我从2020年就住在这里。
He has lived here since he came to Nanjing. 自从来到南京，他就一直住在这里。
for + 时间段, 意为“长达…”
We have known each other for 10 years. 我们认识10年了。
so far, up to now, until / till now “到目前为止”
So far, I have read three books. 到目前为止，我已经读了三本书。
I have been there three times. 我去过那里三次。
次数标志：
once / twice / three times… 一次/两次/三次…
found
has worked
left
went
has
returned
bought
have visited
have lived
have been
have fallen
have been
Have
noticed
are
enjoy
单数形式：there has been + 单数名词
复数形式：there have been + 复数名词
一、单项选择
1. I ______ my homework already. I can watch TV now.
A. finish B. finished C. have finished D. will finish
2. My sister ______ this book twice. She likes it very much.
A. reads B. has read C. read D. is reading
3. They ______ in this school since 2020.
A. study B. have studied C. studied D. will study
4. —______ you ever ______ to Shanghai —Yes, I have.
A. Do; go B. Did; go C. Have; gone D. Have; been
5. We ______ each other for ten years.
A. know B. knew C. have known D. will know
Exercises
一、单项选择
6. I ______ never ______ such an interesting book before.
A. do; read B. did; read C. have; read D. am; reading
7. How long ______ you ______ in this city
A. have; lived B. did; live C. do; live D. are; living
8. My mother ______ just ______ the kitchen. It is clean now.
A. is; cleaning B. has; cleaned C. will; clean D. did; clean
9. —Have you written to your friend
—No, I ______.
A. don’t B. didn’t C. haven’t D. won’t
Exercises
二、句型转换.
1. I have finished my homework.（改为否定句）
I ________ ________ my homework.
2. They have lived here since 2018.（对划线部分提问）
______ ______ have they lived here
3. Tom has finished his work.（改为一般疑问句，并作否定回答）
—______ Tom _________ his work
—No, he ________.
4. I bought a pen yesterday.（用 already 改写为现在完成时）
I ______ already __________ a pen.
haven’t finished
How long
have bought
Has finished
hasn’t
Exercises
We used to live in small houses,
but now most families have moved into new buildings.
What are the changes in your hometown
The quality of life
Transport
Environment
Industry
What are the changes in your hometown
A: Hi! Long time no see. I heard you went back to your hometown last month. How was the visit
B: Oh, it’s amazing!_____________________________________________.
A: Wow, that’s great. My hometown has changed a lot too.______________
_____________________________________________________________.
B: Really ____________________________________________________.
A: That’s cool. In my hometown, __________________________________.
B: Times really have changed. I think our hometowns will become even better in the future.
A: I agree. I can’t wait to go back during the holiday to see more changes!
Pair work
Thank you!

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