8B Unit 1 Grammar 课件2

(共21张PPT)
Unit1 Past and present
Grammar 1
Present perfect tense
coach
1958
People began to use a coach in 1958
People have used a coach since 1958
Taxi
1913
People began to use a taxi in 1913
People have used a taxi since 1913
People began to use a double-decker in 1990
double-decker 1990
People have used a double-decker since 1990
light rail 2002
People began to use a light rail in 2002
Peolpe have used a light rail since 2002
We use the simple past tense to talk about what happened in the past.
Past present
People began to use a light rail in 2002
2002
2011
Miss Min moved house last year.
Xiao Yu learnt to play basketball when he was 9 years old.
We use the present perfect tense to talk about things that started in the past and continue to the present.
present
Past
9 years
Peolpe have used a light rail since 2002
2002
Peolpe have used a light rail for 9 years.
double-decker 1990
People have used a double-decker since 1990.
People have used a double – decker for 11years.
Taxi
1913
People have used a taxi since 1913.
People have used a taxi for 98 years.
People have used a coach since 1958.
People have used a coach for 53 years.
a. 我已经学了六年英语了.
I have learned English for six years.
b. 我自从24岁就教书了．
Ｉhave taught English since I was 24 years old.
I have taught English for 11 years.
c. 自从我们来到这个学校，我们就是好朋友了。
We have been good friends since we came to this school.
d. 我很长时间没吃肉了。
I haven’t eaten pork for a long time.
Eddie has just eaten it.
Hobo thinks that Eddie has changed.
homework
He has finished his already.
He hasn’t finished his homework yet.
现在完成时
have/has + (done)
动词的过去分词
过去分词的构成
原形 过去分词 原形 过去分词
travel visit
move stop
stay finish
own shop
learn solve
travelled
moved
stayed
owned
learned
visited
stopped
finished
shopped
solved
A 规则动词的过去分词
B 不规则动词的过去分词
原形 过去分词 原形 过去分词
think put
catch cost
give grow
make hurt
write run
thought
caught
given
made
written
put
cost
grown
hurt
run
原形 过去分词 原形 过去分词
feel bring
fall wear
fly sing
have forget
drink keep
felt
fallen
flown
had
drunk
brought
worn
sung
forgotten
kept
现在完成时的一般疑问句
Have/Has…done
A: Have you…. A: Has he….
B: Yes, I have. B: Yes, he has.
No, I haven’t. No, he hasn’t.
现在完成时的否定句
have/has not +done
I have not seen Harry Potter yet.
He hasn’t been to Tianjin since then.
1. I (see) that film. It’s very interesting.
2. They (not see) that film.
They know nothing about it.
3. They are playing on the playground.
They (finish) their homework.
4. Mr and Mrs Li (not come) back yet.
Their son is very worried.
5. Xiao Zhu (play) this computer game a few times. He knows a lot about it.
6. Mr. Dong _____________ (repair) over ten bicycles since last Monday.
7. You _______________ (not visit) me for a long time.
have seen
haven’t seen
have finished
haven’t come
have played
has repaired
haven’t visited
A: Have you done your homework
B: Yes, I have.
A: When did you do it
B: I did it an hour ago.
Chat time:
一般过去时和现在完成时的区别
1、概念
2、结构
3、标志
a. 一般过去时
b. 现在完成时
did have/has done
一、动词填空
1) _______Wuxi _______(change) a lot since 2000
2) Millie ________(know) Eddie for ten years.
3) Bob ________(forget) to bring his key last Monday.
4) It _________(rain) heavily when I got home yesterday.
5) I _________(not eat) lunch. I’m hungry.
6) _______your mother _______(cook) at this time yesterday
7) He ___________(not write)the letter last night. He _______(write) it this morning.
8) ________she ________(live) here in the past.
9) Look! The rain ________(stop). We can go out to play.
10) LiuXiang _______(become) interested in running since he ________(be) young.
Mainly conclusion
1. have/has done
2. 两种情况
3. 过去分词
4. 与一般过去时的区别