关于 be 动词,情态动词和实义动词的区别 新人教版英语七年级上册复习资料 到目前为止,我们主要学习了三类动词:be 动词,情态动词和实义动词.下面我们分别来 讲一下它们得用法. be 动词属于系动词 在一般现在时态的句子中主要表现为三种形式:am is,are.后面往往接 动词属于系动词, 形容词或名词做表语.如: (1)I'm strong. (strong 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 girl.(变为否定句) ②You are right. (变为否定句) ③He is strict with me. (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 girl. ②You are not right. ③He is not strict with me. 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. ①I am a worker. (变为一般疑问句) →Are you a worker? ②We are good friends. (变为一般疑问句) →Are you good friends? ③She is from Japan. (变为一般疑问句) →Is she from Japan? ④He is strict with me. (变为一般疑问句) →Is he strict with me? (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: ①I'm well(not bad).(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? 1. 2, 关于情态动词:初中我们常用的情态动词主要有:can, may,must,need.我们这里主要 关于情态动词 以 can 为例来说明情态动词的用法.情态动词后面必须接动词的原形.情态动词 can 的用法类似 于 be 动词. 不论主语为第几人称, 变否定就是在 can 后加 not.变疑问就是把 can 提到句子前面, 它没有人称和数的变化. (1)变否定句:主语+can +not+ 其他. ①I can spell my name.(变否定句) →I can not(can't)spell my name. ②He can dance. (变否定句) →He can't dance. (2)变一般疑问句:Can + 主语+ 其他?即直接把 can 提到句首. ①I can spell my name.(变为一般疑问句) →Can you spell your name? ②He can sing.(变为一般疑问句) →Can he sing? (3)变特殊疑问句:特殊疑问词+一般疑问句? ① I can spell my name. (对划线部分提问) →What can you spell? ② He can play the piano. (对划线部分提问) →Who can play the piano? 3,实义动词,也叫行为动词.就我们现在所学的内容来讲,实义动词所在的句子中一般不存在 ,实义动词,也叫行为动词. be 动词.也就是在含有实义动词的句子变否定句或疑问句时,一定不能用 be 动词.那么,实义 动词究竟怎样用呢?正如 be 动词随着主语的变化可变为 am,is,are 一样,在一般现在时态的 句子中,实义动词在肯定句中,也要随着主语的变化而变化.当主语为第三人称单数 he,she, it 时, 实义动词要变为相应的第三称单数; 当主语为非第三人称单数 I, you(你), we,you(你们) they 时,实义动词要用动词的原形.而在变否定句和疑问句时,不能直接在动词上变,而是要借助另一 类动词:助动词 do,does. (1)肯定句: ①I have a blue pen. ②He has a brother. ③ She wants to be an actor. ④ They like to play football. (2)否定句:主语+don't/doesn't+动词原形.其中 do/does 为助动词,是来帮助实义动词构成 否定或疑问句的,但加了 do/does 后,其后面的动词必须用动词原形. ①I have a blue book.(变为否定句) →I don't have a blue book. ②He has a brother. (变为否定句) →He doesn't have ③She wants to be a teacher.(变为否定句) →She doesn't want to be a teacher. ④They like to play basketball.(变为否定句) →They don't like to play basketball. (3)一般疑问句:Do/Does +主语+动词原形+其他?句中加了 do/does 后,其后面的动词还是 必须用动词原形. ①I have a blue backpack.(变为一般疑问句) →Do you have a blue backpack? ②He has a sister. (变为一般疑问句) →Does he have a sister? ③My brother does his homework before supper. (变为一般疑问句) →Does your brother do his homework before supper? ④She wants to be a teacher. (变为一般疑问句) →Does she want to be a teacher? ⑤They like to play basketball. (变为一般疑问句) →Do they like to play basketball? (4)特殊疑问句:特殊疑问词+一般疑问句? ① Your sister likes English best because it's interesting. (对划线部分提问) →Why does your sister like English best? ② He does his homework before supper. (对划线部分提问) →When does he do his homework? 注意:当含有 and 引导的短语在句中做谓语或宾语,我们把这类句子变否定句时,必须把 and 变 为 or.如: (1)He can swim and dance. (变为否定句) →He can't swim or dance. (2)My father likes English and math. (变为否定句) →My father doesn't like English or math.