关于be动词、情态动词和实义动词的区别

1、.关于be动词、情态动词和实义动词的区别到目前为止，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：(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 st

2、rict 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.精品. i am

3、 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： im well.（对划线部分提问）how are you?she is fr

4、om america. （对划线部分提问）where 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提到句子前面精品.。(1)变否定句：主语+can +not+ 其他。i can spell my name.(变否定句)i can not(cant)spell my name.he can swim. (变否定句)he cant swim.(2)变一般

5、疑问句：can + 主语+ 其他？即直接把can提到句首。 i can spell my name.(变为一般疑问句)can you spell your name? he can swim.（变为一般疑问句）can he swim?(3)变特殊疑问句：特殊疑问词+一般疑问句？ i can spell my name. (对划线部分提问)what can you spell? he can swim. (对划线部分提问)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

6、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，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精品.。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 bas

7、ketball.(2)否定句：主语+dont/doesnt+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。 i have a blue book.（变为否定句）i dont have a blue book. he has a brother. （变为否定句）he doesnt have she wants to be a teacher. （变为否定句）she doesnt want to be a teacher. they like to play basketball. （变为否定句）they dont l

8、ike 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。 i have a blue book.(变为一般疑问句)精品.do you have a blue book? he has a brother. (变为一般疑问句)does he have a brother? my brother does his homework before supper. (变为一般疑问句)does your brother do his homework before supper? she wants

9、 to be a teacher. (变为一般疑问句)does she want to be a teacher? they 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？ your sister likes english best because its interesting. (对划线部分提问)why does your sister like english best? 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 swi