am is are
转变成缩写形式：
I am I'm
What is What's
He is He's
She is She's
It is It's
We are We're
You are You're
They are They're
I am not I'm not
He is not He isn't
She is not She isn't
It is not It isn't
We are not We aren't
They are not They aren't
按“主+系+表”结构完成句子：
1.（肯定）我是个学生。
I am a student.
2.（否定）我不是个学生。I am not a student.
3.（问句）你是个学生吗？
Are you a student?
Yes, I am. Yes. I am.
No, I am not. No. I'm not. .
改缩写格：
例 1. I am a student. I'm a student.
2. He is a doctor. He's a doctor.
3. She is a nurse. She's a nurse.
4. It is a book. It's a book.
5. We are classmates. We're classmates.
6. They are good friends. They're good friends.
7. I am not a student. I'm not a student.
8. He is not a doctor. He isn't a doctor.
9. She is not a nurse. She isn't a nurse.
10. It is not a book. It isn't a book
11. We are not children. We aren't children.
12. They are not drivers. They aren't drivers.
对疑问句作肯定和否定回答：
1. Are you a student？
Yes, I am. No, I'm not.
2. Is he a student？
Yes, he is. Yes. He is. No, he isn't. No. He isn't.
3. Is she a nurse？
Yes, she is. Yes. She is. No, she isn't. No. She isn't.
4. Is it a book？
Yes, it is. Yes. It is. No, it isn't. No. It isn't.
5. Are you classmates？
Yes, we are. No, we aren't.
6. Are they good friends？
Yes, they are. No, they aren't.
句子改错：
1. I am not a students.
2. He is good teacher. He is not good cook.
3. Is she your classmate？ No， she aren't.
4. Are you in class four？
5. Are they from American？
6. Is it you car？
7. We is from France.
8. Are Lucy ten？
9. Are your father a teacher？
10. Is Lucy your sister's？
