Unit 2 On the Weekend.Lesson 4 Helping at Home Period2参考课件(共17张PPT)

(共17张PPT)
北师大版《初中英语》八年级下册
Unit 2 Communication
Lesson 4（第二课时）
mad
sound
Scientists have done a lot of research on
subject
(adj.) 1. angry 2. crazy
1. (n.) something that you can hear 2. (v.) to seem to you when you hear or read about them
(n.) 1. a thing that is discussed or studied 2. an area of knowledge that is learned in a school
Can you answer these questions
1 How do scientists study animal communication
2 What have scientists done with mice so that they can help people
3 Are people interested in animal communication now or for a long time How do you know
They have done a lot of research on this subject.
They have trained mice to find landmines.
People have always been interested in animal communication.
Can you answer these questions
They have done a lot of research on this subject.
They have trained mice to find landmines.
People have always been interested in animal communication.
They have done a lot of research on this subject.
They have trained mice to find landmines.
People have always been interested in animal communication.
They have done a lot of research on this subject.
They have trained mice to find landmines.
People have always been interested in animal communication.
Find more sentences in the text.
have done
have trained
have always been
Dogs have helped the police for a long time, too.
Scientists have discovered that even ants use smell.
Everyone has heard birds singing.
Research has shown that many other animals use sound to communicate.
Animals have always used body language to communicate as well.
现在完成时
发生在过去，持续到现在或对现在有影响。
Scientists have discovered that even ants communicate this way.
Everyone has heard birds singing.
现在完成时
主语+ 助动词+ 过去分词
I/ You/ We/ They
He/ She/ It ________
________ learned
said
seen
been
has
have
have
has been
is
has bitten
barks
have found
take
1 She has always loved animals.
2 He has never had a pet.
3 Molly has been my pet for 10 years.
4 I have had a pet tortoise since I was ten years old.
Do you have any pets
Have you ever watched an animal
How do they communicate
Homework
Please write down what you know about animal communication.
Thank you!