系动词Be(am, is, are)的用法
一、请记住以下口诀：
I用am，you用are，is连着he，she，it； 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。 二、Be动词在一般过去时中的变化：
1．am 和is在一般过去时中变为was。（was not = wasn’t） 2．are在一般过去时中变为were。（were not = weren’t）
3．带有was或were的句子，其否定、疑问的变化和am,is, are一样，即否定句在was或were后加not，一般疑问句把was或were调到句首。
相关练习题
一、用am, is, are 填空
1. 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? 11. That __ ____ my red skirt. 12. Who __ ____ I ?
13.The jeans _ ____ on the desk. 14.Here_____ a scarf for you.
15. Here __ __some sweaters for you. 6. The two cups of milk ___ ____ for me. 17. Some tea ____ ___ in the glass. 18. Gao shan's shirt ___ ____ over there. 19. My sister's name __ _ Nancy. 20. This __ ____ not Wang Fang's pencil. 21. __ ____ David and Helen from England? 22. There __ ____ a girl in the room. 23. There ___ ___ some apples on the tree. 24. ___ ____ there any kites in the classroom? 25. ___ ___ there any apple juice in the bottle? 26. There ___ ____ some bread on the plate.
27. There ___ __ a boy, two girls, three men and ten women in the park. 28. You, he and I __ ____ from China. 二、用be动词的适当形式填空 1. I ____ ___ at school just now（刚才）. 2. He __ _____ at the hotel last week. 3. We ___ _____ students two years ago.
4. They ___ _____ on the farm a moment ago(刚才). 5. Yang Ling ___ _____ eleven years old last year. 6. There __ _____ an apple on the plate yesterday. 7. There ____ ____ some milk in the fridge on Sunday. 8. The phone ___ ____ on the sofa yesterday evening. 9. I ___ ___ an English teacher now. 10. She ___ ____ happy yesterday.
11. They ___ ____ glad to see each other last month. 12. Helen and Nancy ___ ____ good friends. 13. The little dog ______ two years old this year.
14. Look, there ___ _____ lots of grapes here.
15. Today ___ ___ the second of June. Yesterday __ ____ the first of June. It ___ ___ Children’s Day. All the students __ __ very excite
am, is, are的用法
1. is和are可分别与not缩写为isn’t和aren’t，但am却不能与not缩写为amn’t ，虽然有人把它缩为ain’t，但这毕竟是规范的口语说法，不宜仿用。
2. 陈述部分为第一称肯定式时的反意疑问句，通常用aren’t如： I’m late, aren’t I?我迟到了，是吗？ 3. 不要认为在主语之后总是用am。试看：
Both he and I are right. 他和我都对。或他和我都不对。 Neither he nor I am (或are) right. 他和我都不对. \"I\" is an English letter. I是英语字母。
4. 当am, is are 位于句末时，均不能与主语缩写。如： Tell me where he is (不能用he’s )。告诉我他在哪儿。 He is taller than I am (不能用I’m )。他比我高。 A：Are they watching TV? 他们在看电视吗？ B：Yes, they are. (不能用they’re)是的。
注：若其后有not时，am, is, are则可以与主语缩写，其中is和are 也可与not 缩写。如：
Are they watching TV? -No, they’re not (或they aren’t).
初一英语am, is, are 专项练习
1. 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? 11. That ___ ___ my red skirt. 12. Who __ ____ I?
13.The jeans __ ____ on the desk. 14.Here ___ ___ a scarf for you. 15. Here __ ____ some sweaters for you. 16. The black gloves ___ __ for Su Yang. 17. This pair of gloves __ ____ for Yang Ling. 18. The two cups of milk __ ___ for me. 19. Some tea ___ ___ in the glass. 20. Gao shan's shirt ___ ____ over there. 21. My sister's name __ ____Nancy. 22. This __ ____ not Wang Fang's pencil. 23. ____ __ David and Helen from England? 24. There __ ____ a girl in the room. 25. There __ ___ some apples on the tree. 26. __ _____ there any kites in the classroom? 27. __ ____ there any apple juice in the bottle? 28. There ___ ___ some bread on the plate.
29. There ___ ____ a boy, two girls, three men and ten women in the park. 30. You, he and I __ ____ from China.
