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(共21張PPT)
The world of science
Using language
Unit 3
Activity 1
Describe the paictures with Present perfect tense.
Most students have read the book by now.
He has finished his homework.
表示說話時已經完成的動作，而且這個動作的結果對現在還有影響
Activity 1
Describe the paictures with Present perfect tense.
She has taught in our school for 22 years.
表示動作發生在過去，但一直持續到現在，并且有可能繼續持續下去
使用現在完成時的注意事項
時間狀語
during/ over/ in the last/ past+時間段, ...等時間狀語
since+時間點,
already,
recently, lately,
so far, up to now, until now
for＋時間段,
ever since
these days (years, months, weeks)
1. After several years of observation, the research group
_______________(arrive) at the conclusion that language acquisition is faster when students are exposed to the situation where it is spoken.
2. Great changes _____________(take) place in my hometown and you can see that a lot of factories have been set up.
has arrived
have taken
Q:上面的句子沒有時間狀語，為什么要用現在完成時？
A: 根據語境；表示“到目前為止，已經……”
1. It is the first time that the local education authority _____________ (make) such strict requirements on going-to-school time for primary and middle school students.
2. It ______________(be) ten years since we met last time.
3. We ______________(be) to Beijing four times, so this time we won’t choose Beijing as a destination.
has made
is/has been
have been
Q:上面的句子沒有時間狀語，為什么要用現在完成時？
A: 固定句型
It is + 序數詞+ time that sb have/has done sth.
It is /has been...時間 since sb did sth.
sb. have/has done sth+次數
Activity 1
Describe the paictures with Present perfect tense.
The book has been read by most students by now.
Most students have read the book by now.
現在完成時的被動語態
現在完成時
現在完成時
謂語結構
主動
被動
have/has done
have/has been done
(1)The door has been locked.
(2)These flowers have been watered, and you can go home.
(3)Our classroom has been cleaned, so you needn't clean it now.
主語與謂語動詞是被動關系
Practice
1. More than 50,000 yuan (raise) for the poor family since the group was founded.
2. The famous musician, as well as his students, ________(invite) to perform at the opening ceremony last night.
3. In the last five years, Cao ___________ (walk) through 34 countries in six continents.
has been raised
was invited
has walked
Practice
3. This is the first time that a woman_____________(appoint) to the post.
5. There ____________(be) a dramatic rise in the number of extreme weather events over the past 20 years, caused largely by rising global temperatures, according to a new report from the United Nations.
has been
has been appointed
Activity 3
Read and rewrite.
Many things in our lives have already been affected,
3D-printed hamburgers have been served to customers in some restaurants in London.
But perhaps the most significant success that has been achieved to date is in medicine.
Human body parts, including a beating heart, have been made with 3D printing technology.
A new 3D-printed shell has been given to a turtle injured in a forest fire!
現在完成時練習一
1、During the last three decades, the number of people participating in physical fitness programs _____________(increase) sharply.
2、After several years of observation, the research group____ ______ (arrive) at the conclusion that language acquisition is faster when students are exposed to the situation where it is spoken.
3、Simon_____________(attend) his father for such a long time that he understands almost every gesture of his father’s.
4、It is the first time that the local education authority ________ (make) such strict requirements on going-to-school time for primary and middle school students.
5、Over the last few years, the number of students participating in volunteer programs ______________ (increase) sharply in our school.
has increased
has arrived
has attended
has made
has increased
6、Researchers believe that since 2010 an average of nearly 35,000 elephants _____________ (kill) annually on the continent.
7、With the help of high technology, more and more new substances _______________ (discover) in the past years.
8、In the past few centuries，the lighthouses along North Carolina’s coast __________________ (recognize) as signs of safety for travelers at sea.
9、I complained to the manager of the hotel about the poor service last week, but up to now，I ____________ (receive) his reply.
have been killed
have been discovered
have been recognized
haven't received
10、Large quantities of water, as well as some other timely help including a medical team_______________(offer) since the serious drought hit Yunnan Province.
11、More than one worker _________________（send）to the training center to improve their working skills in the past three years.
12、Since 2011, the country ___________(grow) more corn than rice.
13、 Regularly eating out seems to _____________ (become) common for many young people in recent years.
has been sent
has grown
have become
have been offered
Activity 4
Imagine you are Dr Moore. Look at the pictures and tell the police about the damage and loss to your lab. Use the present perfect passive where appropriate.
The window has been broken.
The lock on the door has been broken.
My two laptops have been stolen.
Beakers and test tubes have been destroyed.
The robot has been damaged.

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