Unit 1 Past and Present Grammar 课件（15张）

(共15张PPT)
8B Unit 1
Grammar
Present perfect tense
现在完成时态 1
When do we
use
？
Present Perfect Tense
We use Present Perfect Tense
to talk about
an action that started in the past and continues up to the present.
an action that happened in the past and have a connection with the present.
how many times an action has happened till now.
I have lived here since I was born.
I’ve just eaten it.
I ate the food, and there’s nothing left for you now.
I have already watched this film twice.
have/has +p.p.
(过去分词）
Present Perfect Tense
Different situations
an action that started in the past
and continues up to the present.
an action that happened in the
past and have a connection with
the present.
how many times an action has
happened till now.
Peter has read this book many times.
Has the town changed a lot
Times have changed.
We have lived in this area since then.
We haven’t moved house for two years.
Examples
Present Perfect Tense
has read
Has... changed
have changed
have lived
haven’t moved
have /has+past participle
(p.p.)
thought
made
felt
been
gone
谓语动词
过去分词
regular verbs
irregular
verbs
read
Present Perfect Tense
Regular Verbs Irregular Verbs most verbs +ed finish-finished A-A-A型 cost-cost-cost
hit-hit-hit
verbs ending in -e +d love-loved smile-smiled A-A-B型 beat-beat-beaten
verbs ending in a consonant+y -y+ied cry-cried study-studied A-B-A型 come-came-come
become-became-
become
short verbs end-ing in a vowel+a consonant double the consonant +ed step-stepped mop-mopped rub-rubbed A-B-B型 pay-paid-paid
hear-heard-heard
A-B-C型 eat-ate-eaten
go-went-gone
Present Perfect Tense
A short test
borrowed
hoped
made
got
planned
cried
sent
watched
said
grown
hit
enjoyed
Sentence pattern Structure Examples
肯定句 主语+have/has +p.p. (动词过去分词)+其他 Times have changed.
I’ve just copied all the new words.
She has lost her purse.
否定句 主语+have/has +not +p.p.+其他 We haven’t moved house for two years.
She hasn’t travelled on a train.
一般疑问句 及回答 Have/Has+主语+p.p.+其他？ 肯定回答：Yes,主语+have/has. 否定回答：No,主语+haven’t/hasn’t. (有时也可用“No,not yet./No,never.) --Has the town changed a lot
--Yes, it has.
--Have they found the lost books
--No, they haven’t.
特殊 疑问句 特殊疑问词+have/has+ 主语+p.p. +其他？ How long have you lived in Suzhou
How many times has he been to the Great Wall
Present Perfect Tense
have not=haven’t
has not =hasn’t
Present Perfect Tense
A short test
have/has +p.p.
(过去分词）
have finished
has visited
has repaired
haven’t seen
haven’t come
has taught
Present Perfect Tense
1. We haven’t finished our homework so far.(Positive statement)
2. The rain has already stopped.(Negative statement)
3. They have been to the space museum recently.(Yes or No question)
4. My taste has changed a little over the years.(Negative statement)
5. Eddie’s eaten Hobo’s food three times.(Wh-question)
Change sentence patterns based on request.
We have finished our homework so far.
The rain hasn’t stopped yet.
Have they been to the space museum recently
My taste hasn’t changed a little over the years.
How many times has Eddie eaten Hobo’s food
Present Perfect Tense
Time expressions
since&for since 介词：后跟过去时间点 连词：后跟过去时态从句 since last year/ since two years ago
...since we came here.
for 介词：后跟一段时间 for two years
for a century
She has lived in Beijing since she was born.
I haven’t played football for several years.
They have been married since 2001.
Present Perfect Tense
Time expressions
放于句尾或句首的时间状语：over these years;in the last/past few years;so far;recently;before...
So far, we have written 13 songs.
Our hometown has changed a lot over these years.
He has changed his lifestyle recently.
Our government has made laws to protect environment in the past ten years.
Present Perfect Tense
Time expressions
时间副词：just; already;yet(句尾）;ever;never等，常放于句中（助动词之后，行为动词之前） already yet already一般用于肯定句中 yet 用于疑问或否定句中 They have already had their lessons.
He hasn’t arrived yet.
Have you discussed your plan yet
ever never 多用于否定或疑问句中，表示”曾经，从未“ Have you ever tried spicy chicken
Peter has never seen a bird like that.
just 表示到说话时为止的状语，意思是“刚刚” I have just seen her, but I don’t know where she is now.
He has just eaten 3 apples.
just now 刚才，用于过去时态中。
Present Perfect Tense
Chat time:
Millie: _________ you ________(see) any films recently, Sandy
Sandy: No, I haven’t. What about you
Millie: I __________（see) one last Saturday.
Sandy: What’s it about
Millie: It’s about the changes in Beijing over the past century.
From this film, I _____________(learn) more about Beijing’s past
and present.
Sandy: Oh, I think I ____________(hear) about the film. Do you plan to
see it again
Millie: Yes, I’d like to.
Have seen
saw
have learned
have heard
1. Review Present Perfect Tense.
2. Finish off an after-class quiz.
Homework