be动词用法.doc

be动词用法be动词的一般现在时有三种形式，即：am,is,are。1.如果主语是第一人称I（我）时，be动词用am。如：Iamastudent.我是一名学生。Iam还可缩写成Im。如：ImDavid.我是大卫。2.如果主语是you（你，你们）,they（他们，它们，她们）或名词复数（两个以上的人或物）时，be动词必须用are。如：Areyoutwelve?你是十二岁吗？TomandLilyaregoodfriends.汤姆和莉莉是好朋友。Theyareatschool.他们在学校。These are books. 这些是书。We are students . 我们是学生。are与主语还可缩写。如：Weare=Were，Theyare=Theyre,Youare=Youre。而are与not可缩写成arent。如：Theyarentstudents.他们不是学生。但是am与not不能缩写。3.如果主语是单数名词、不可数名词或单数第三人称代词（he,she,it）时，be动词用is.如:Mymotherisateacher.我的妈妈是一名老师。Heisastudent.他是一名学生。She is my friend.她是我的朋友。It is a dog. 它是一只狗。This is a bike .这是一辆自行车。That is a cup . 那是一个杯子。is也可与主语缩写,如:Heis=Hes,Mymotheris=Mymothers等。但是Thisis不可缩写。而is与not可缩写成isnt。如:Thisisntabook.这不是一本书。解题过程根据以上叙述我们可以把动词的用法以口诀的形式表述出来：我（I）是am,你（you）是are,剩下is留给她（she）,他（he）,它（it）,两个以上都用are。be动词用法歌 be动词真伟大，生出is, am, are。我用am，你用are，is连接他，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。1 用动词be （am， are， is）填空 I _ a student. Lucy and Lily _ from USA. -Who _ they? - They _ Jim, Mike and John. The white shirts _on the chair. Their bikes _ under a big tree. His father _ at home. How old _ you? _ there any birds in the tree?2 选择填空-What class _ you in? - I_ in Class One. A are;are B are;am C are; isThey _ new students. We _ not new. A are ; are B are; am C are ; is-Where _ his pencils? - Oh, in his bag. A is B are C amMiss Gao _ our teacher. She _ tall. A are; are B are; is C is; isTheir classroom _ over there. A areB isC amI think Ann and Betty _ in the classroom. A is B amC areBe动词的用法及介绍“Be”动词的意思是”是”,它随人称的变化而变化.1. be动词属于系动词, 在句子中主要表现为三种形式：am is、are。后面往往接形容词或名词做表语。如：(1)Im young. (young形容词做表语)(2)He is a boy.( a boy名词做表语) 含有be动词的句子在进行否定、疑问句变化时，都要在be动词上变化。(1)变为否定句：主语+be+ not+其他。即，直接在be后not.Im a Chinese boy.(变为否定句)You are good. (变为否定句)He is strict with us. (变为否定句)She is from America. (变为否定句)以上四个句子中都含有am、 is或are，变否定句时，直接在am 、is、are后面加上not.即：Im not a Chinese boy.You are not good.He is not strict with us.She is not from America.(2)变为一般疑问句：Be+主语+其他？即把be动词提到主语的前面。注意：当肯定句主语为第一人称I和We时，变一般疑问句要变为第二人称，be动词也要相应的变为are.同样肯定句中的my和our 也要变为your. I am a boy. (变为一般疑问句)Are you a student? We are good friends. (变为一般疑问句)Are you good friends? She is from America. (变为一般疑问句)Is she from America? He is strict with us. (变为一般疑问句)Is he strict with us?(3)变特殊疑问句：一般的要求为“对划线部分提问”，即用特