一个他/她/它后用is，缩写形式是`s。
They are my friends . We are from Canda . Li Ming and Jenny are friends . Jenny and I are good friends . You are my friend . All of them are friendly. Chinese people are great. There are mine.
Be动词的用法
be的形式
am is are
be
was
是, 为，在
were been
I am Li Ming . I am Jenny . I am from Canada . I am a stutisfied with your work. (I am = I’m) 一个“我”（I）后用am，缩写形式是I`m。
看一看，找规律
1.I was a student 2 years ago. 2.He was 15 years old last year. 3.Li Ming`s grandfather was a doctor. 4.My best friend was in the classroom just now. 5.We were in Hanzhong yesterday. 6.They were students last year. 7.Were Li Ming and Danny in the U.S.A. last month? 8.--Were these students in Grade 7 last term? --Yes, they were./No, they weren`t.
He is in Class Four . She is in Class Five . It is a book . My father is a teacher. This is our classroom . Li Ming is my classmate . Jenny is from Canada .
两个/你后要用are，缩写形式是`re。
运用口诀1：
be的形式很多样，现在时态有三个， 我（I）后am，你(you)后are， is跟着他(he)她(she)它(it)， 单数is,复数are,其实用法很简单。
学以致用
1. I am a girl. 2. You are a teacher. 3. He is my father. 4. She is fine. 5. It is a ruler. 6. His pen is red. 7.My cat is nice. 8. We are friends. 9. They are good boys. 10. Li Ming and Li Hua are students.
过去式有两个，单数后面用was，复数后面全用were.
看一看，找规律
1.I have been to Xi`an for many times. 2.He has been here for 3 years. 3.--Have you been to Beijing? --Yes, I have. 4.--Has Li Ming been here for a long time? --No, he hasn`t. 过去分词就一个，have/has后用been。
• 3. This is my key. →This isn′t my key. →Is this your key?↑ Yes, it is.(肯定回答不能缩写.) No, it isn′t. 注：以this,that 作主语的问句，回答用Yes, it is. No, it isn′t. 而以these, those作主语的问句，回答用 Yes, they are. No, they aren′t. 触类旁通： These are my classmates. →_________________________.(否定句) →_______________________?(一般疑问句) Yes,__________. No, __________.
例句演示3
运用口诀2
有be句型变否定，be后not加起来 有be句型一般疑问句，be动词提前加问号？ 肯定回答:Yes 主+be,否定回答:No主+be not . is not = isn’t are not =aren’t Is this... ?/ Is that... ?/ Is it... ?回答都是: 肯定回答：Yes, it is.否定回答：No, it isn't. Are these.../Are those...?/Are they...?回答都是: 肯定回答：Yes, they are.否定回答：No, they aren`t.
例句演示2
• 2. I’m a good student. →I′m not a good student. →Are you a good student?
(变为一般疑问句时第一人称换为第二人称)
Yes, I am.(肯定回答不能缩写.) No, I′m not. 现学现卖：
I`m a doctor. →___________________.(否定句) →___________________？(一般疑问句) • Yes,________.
例句演示1
• 1. You are a boy. • →You aren′t a boy. • → Are you a boy?↑ Yes, I am.(肯定回答不能缩写.) No, I′m not. • 熟能生巧： • He is a teacher. →______________________.(否定句) →____________________?(变一般疑问句) Yes,__________. No, __________.