学习必备欢迎下载Be 动词专题讲义一.概念Be 动词有三个: am ,is,are我用 am ,你用 are ,is 连着他,她,它 , 单数名词用 is ,复数名词全用 are 。二.用法剖析1. 如果主语是第一人称I (我)时, be 动词用 am。I am 还可缩写成 I'm。如: I'm David. 我是大卫。2.如果主语是第三人称代词、单数名词或不可数名词时,be动词用 is。如: He is a student. 他是一名学生。My mother is a teacher. 我的妈妈是一名老师。is也可与主语缩写。如: He is = He's, My mother is = My mother's等。但是 This is 不可缩写。而 is 与 not 可缩写成isn't。如:This isn't a book. 这不是一本书。3. 如果主语是第二人称you ,be 动词必须用 are。如果主语是名词复数(两个以上的人或物)时,be 动词必须用 are。如: Tom and Lily are good friends. 汤姆和莉莉是好朋友。They are at school. 他们在学校。are与主语还可缩写。如:We are= We're。而 are与 not 可缩写成 aren't。如: They aren't students. 他们不是学生。单数名词用is ,复数名词全用are 。如: The book is over there.(一本书) The books are over there.(多本书)疑问句变化口诀: 变疑问, be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。变疑问,往前提,句末问号莫丢弃。(陈述句中谓语为is,are,am时,变疑问句只将其提前)如: It is a book. 变为: Is it a book? 变否定,更容易,be 后 not 莫忘记。如: It is a book. 变为 : It is not a book.(否定句)疑问否定任你变,句首大写莫迟疑。如: It is a book. 变为: Is not it a book?(疑问否定句)学习必备欢迎下载巩固练习1、Helen____ a student 2、This _____my book. 3、My father______a cook. 4、Jack ’s friend____in the study.5、Your mother_____swimming. 6、Your sister______in the study. 7、Those jackets_______my sister’s.8、That______her dog. 9、The cat_______on the desk. 10、The books_______under the table. 11、His sisters______running. 12、This train____for Shanghai. 13、The dress______too big. 14、This book______for you. 15、The waitress...