初中be动词的用法.doc

Be动词的用法be 动词am, is ,are 的原行，be动词在句中运用时，在一般现在时句中，需根据句子主语的不同，选择用am, is, are，而be动词一般不直接用在句中am, is, are 在句中的用法（我用am ，你用are , is用于他、她、它，复数全部都用are. ）：(1) am 是，“am”要与第一人称代词“I”连用，即，只有句子主语为“I”时，“I”与“am”缩写形式为I’m.如：I am a student.I am Michell.(2) is 是， “is”用在句子主语为单数时，或不可数名词时使用其缩写形式为 He’s , She’s, It’s.如：He is twelve. She is my sister. It is a clock.(3) are 是， “are”用在句子的主语为you，表示有两个或两个以上数目的复数名词，代词以及“and”连接的两者或多者一起构成的主语时其缩写形式为 you’re .（习惯上）如：You are a student. Tom and I are good friends.注意：am , is , are 与前面的代词或名词的缩写形式只用在句中，且在它们之后还有其他词时；如果无其他单词时，则不应将它缩写。

如: --- Are you Michell? --- Yes, I am. (此时的I 与am 不能缩写)1. Be 动词的否定形式的变化：否定句：只需要在be（am, is, are）后面加上not 就行但要注意缩写形式 如：I am not a student.You aren’t a teacher.He isn’t a good man.There isn’t a pen.There aren’t some bags in the shop .(am not , is not=isn’t are not =aren’t)总结：am 一般与not 一起时不缩写；is 与not 缩写为isn’t ， are not 缩写为aren’t , isn’t 和aren’t 在句中运用时， 不管后面有无其他单词都可以用，不用分开写 如：a. ----Is that an English book? ----No, it isn’t. b. We aren’t teachers. We’re students.3.一般疑问句：只需要把be动词提到句子开头就行，第一个字母要大写。

Are you a good student? Yes, I am. Is he reading books? No, he isn’t. Is there a new school in your hometown(家乡)？Yes, there is. Are there your parents and your grandparents in your family? Yes, there are.课堂练习：一、 用be 动词的适当形式am , is ,are 填空：1. ---- What this in English ?2. Jack Smith a boy.3. you Jenny?4. 200-61009 her phone number.5. I girl. Michell my name .二、 写出下列词语的缩略形式1. I am 2. It is 3. What is 4. are not 5. is not 三、 选择填空1. My friend is a boy. name is Tony Smith.A. It’s B. Her C. His D. You2. Her Mary Hand .A. name B. is name C. name are D.name’s 3. Gina and I English girls.A. am B. is C. are D.it’s4. is a clock.A. I B.She C.It D.What 5.The teacher told the students that the earth round , not flat.(平的) A.was B.is C.has been D.is being6.---Is this an eraser ? ---- , it .A. Yes, isn,t B. Yes , is C. No , is D.No, not 。