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1、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。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：1I m young. young 形容词做表语 2He is a boy. a boy 名词做表语 含有be动词的句子在进行否认、疑问句变化时，都要在be动词上变化。1变为否认句：主语+be+ not+其他。即，直接在be后not. I m a Chinese boy.变为否认句 You are good. 变为否认句 He is strict with us.变为否认
2、句 She is from America.变为否认句以上四个句子中都含有 am、 is 或 are ，变否认句时，直接在 am 、 is 、 are 后面加上 not. 即： I m not a Chinese boy. You are not good. He is not strict with us. She is not from America. 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
3、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? 变特殊疑问句：一般的要求为“对划线局部提问，即用特殊疑问词 代替划线的局部，后接省略划线局部的一般疑问句 一般不再出现划线 局部。如: I mwell.对划线局部提问Howare you ? She is from America.对划线局部提问Where
4、is she from?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。不管主 语为第几人称，变否认就是在can后加not.变疑问就是把can提到 句子前面。1变否认句：主语+can +not+ 其他。 I can spell my name.变否认句t I can notcan tspell my name. He can swim.变否认句t He can t swim .2变一般疑问句：Can +主语+其他？即直接把can提到句首。
5、I can spell my name. 变为一般疑问句t Can you spell your n ame? He can swim.变为一般疑问句t Can he swim?3变特殊疑问句：特殊疑问词+般疑问句？ I can spell my name.对划线局部提问tWhat can you spell? He can swim.对划线局部提问t Who can swim?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 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
6、变化可变为 am is、are 一样，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： I have a blue book. He has a brother. She wants to be a teacher. They like to play basketball. 否认句：主语+don t/doesn t+动词原
7、形。其中do/does为助动词，是来帮助实义动词构成否认或疑问句的，但 加了do/does 后，其后面的动词必须用动词原形。 I have a blue book. 变为否认句I don t have a blue book. He has a brother. 变为否认句 He doesn t have She wants to be a teacher. 变为否认句 She doesn t want to be a teacher. They like to play basketball. 变为否认句 They don t like to play basketball.3一般疑问句：
8、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。 I have a blue book. 变为一般疑问句 Doyou have a blue book? He has a brother. 变为一般疑问句 f Doeshe have a brother? My brother does his homework before supper.变为一般疑问句 f Doesyour brotherdo his homework before supper? She wants to be a teacher.变为一般疑问句f Doesshe
9、want to be a teacher? They like to play basketball.变为一般疑问句f Dothey like to play basketball?4特殊疑问句：特殊疑问词+般疑问句？ Your sister likes English best because it s interesting. 对 划线局部提问fWhydoes your sisterlike English best? He does his homework before supper.对划线局部提问f Whendoes 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 否认句时，必须把and变为or.如：1He can swim and dan ce.变为否认句f He can t swim or dan ce.2My father likes En glish and math.变为否认句f My father does n t like English or math.