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必动词(be动词)

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/02 18:48:07
be用在什么句式里.
解题思路: be动词
解题过程:
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)I’m 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.
①I’m a Chinese boy.(变为否定句)
②You are good. (变为否定句)
③He is strict with us. (变为否定句)
④She 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:
①I’m not a Chinese boy.
②You are not good.
③He is not strict with us.
④She 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.
① I am a boy. (变为一般疑问句)
→Are you a student?
② We are good friends. (变为一般疑问句)
→Are you good friends?
③ She is from America. (变为一般疑问句)
→Is she from America?
④ 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”,即用特殊疑问词代替划线的部分,后接省略划线部分的一般疑问句(一般不再出现划线部分)。如:
① I’m well.(对划线部分提问)
→How are you?
②She is from America. (对划线部分提问)
→Where is she from?
be动词有am, is, are三种形式。其使用方法可依据以下口诀:(I)我用am,(you)你用are, is连着他、她、它(he, she, it)。单数is,复数are。如: I am a doctor. You are a girl. She is at school now. This is a good book. Those are new desks.
be 动词的基本含义是"是",有时也可不必译出。如: The flag is red. 这面旗是红色的。My father is forty-six. 我父亲四十六岁。

缩略形式
1. am, is和are与绝大多数主语或疑问词有缩略形式,分别为: 'm, 's和 're。如:
I'm an English teacher. He's my good friend. They're some books. Where're the children?
2. is, are 与not可缩略成isn't和aren't。如: It isn't a map. You aren't in the same class.
特别提醒: 1. this与is没有缩略形式;am与not没有缩略形式。
2. 在对以be动词开头的一般疑问句作简略的肯定回答时,不能使用缩略形式。如:
-Is his hair brown?
-Yes, it is.(正)
-Yes, it's.(误)
be动词除了作系动词外,还可作助动词,典型用法之一就是与"动词-ing"形式一起构成现在进行时,此时它没有实际意义,变化规律同其作系动词时完全相同。如: They are talking. He's walking. It isn't singing.
最终答案:略