Be动词的几种形式与用法
be动词包括am，is，are.
一．肯定式与否定式(以人称代词为例) 肯定句：主语+ be +其它。 否定句：主语+ be + not +其它。 I am a student. I am not a doctor. She is Lucy. She is not Lily. They are at home, They are not at school.
按要求完成句子
• 4.The ruler is on the desk. • 否定句: • 一般疑问句: • 回答： • • • • • • • • 5.My shoes are 20 yuan . 否定句: 一般疑问句: 回答： 6.My name is Andy. 否定句: 一般疑问句: 回答：
__ _ _ _
按要求完成句子
• • • • 1.His brother is a teacher. 否定句: 一般疑问句: 回答：
• • • • • • • •
2.Those are his parents. 否定句: 一般疑问句: 回答： 3.I’m 14 years old. 否定句: 一般疑问句: 回答：
Be动词的用法口诀：
I用am，you用are， is连着他，她，它； 单数名词用is，复数名词全用are, 变疑问，往前提，句末问号莫丢弃; 变否定，更容易，be后not莫忘记, 疑问否定任你变，句首大写莫迟疑。
课堂习题
用am, is, are 填空
• • • • • • • • • 1. -Who ______ I? -I ______ a boy. -______ you a boy? -No, I _____ not. 2. The girl______ Jack's sister。 3. The dog _______ tall and fat. 4. The man with big eyes _______ a teacher. 5. ______ your brother in the classroom? 6. -Where _____ your mother? - She ______ at home. 7. How _______ your father? 8. Mike and Liu Tao ______ at school. 9. Whose dress ______ this? 10. Whose socks ______ they? 12. Who ______ I ?
疑问式 Am I...... ?
简略回答 Yes, I am. No, I am not.
Is he/ she/ it......?
Are we/ you/ they......?
Yes, he/ she/ it is. No, he/ she/ it isn’t
Yes, we/ you/ they are. No, we/ you/ they aren’ t
缩略形式 eg: I’m a boy. You’re ten years old. She’s my sister.
I’m not a nurse. You’re not our classmates. She’ not my brother.肯定式源自否定式I am→I’m
you are →you’re he is→he’s she is→she’s it is →it’s we are→ we’re they are→ they’re
肯定式 I am a student. He /She/It is......
否定式 I am not a student. He /She/It is not.......
We/You/They are...... We/You/They are not ......
疑问式与简略回答 一般疑问句：Be +主语+其它？ 回答：Yes, 主语+be. / No, 主语+be+not. Are you a teacher? Yes, I am. / No, I am not. Are you students? Yes, we are . / No, we aren’t. Is he a worker? Yes, he is. / No, he isn’t.
I’m not.
you’re not. / you aren’t. he’s not. / he isn’t . she’s not. / she isn’t. it’s not. / it isn’t. we’re not. / we aren’t . they’re not. / they we aren’t .
写出下列词适当形式:
• • • • • • • • 1.I am (缩略形式) ____ 2.is (复数)_____ _ 3.we are (缩略形式) ____ 4.are not(缩略形式) ____ 5.is not (缩略形式) _____ 6. it's(完整形式) _____ 7.she's(完整形式) _____ 8. they're(完整形式) ___ __