初中be动词的用法

1、初中be动词的用法be动词的用法(2011-11-5)1. 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im.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 hes

2、 , shes, its.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 youre .（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

3、. (此时的i 与am 不能缩写)2. 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 arent a teacher.he isnt a good man.there isnt a pen.there arent some bags in the shop .(am not , is not=isnt are not =arent)总结：am 一般与not 一起时不缩写；is 与not 缩写为isnt ， are not 缩写为arent , isnt 和arent 在句中运

4、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 isnt. b. we arent teachers. were 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 isnt. is there a new school in your hometown(家乡)yes, there is. are there your parents and your gr

5、andparents 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. its b. her c. his d. you2. her mary hand .a. name b. is name c. name are s 3. gina and i english girls.a. am b. is c. are s4. is a clock.a. i teacher told the students that the earth round , not flat.(平