专题: 把肯定句改成否定句把肯定句改成否定句分以下情况：1、 句中有be动词的，在be动词后加not；2、 句中有情态动词的（can ,should，must ，would），在情态动词后面加not；3、 句中没有be动词和情态动词的，在动词前加dont或doesnt ； 句中动词为原形的，加dont .如： I like apples. I dont like apples. 句中动词为三单式的，加doesnt，并将三单式的动词还原成原形。如：He likes apples. He doesnt like apples.时态为过去时的,要加didnt 而且动词过去式要改为原形,例:I went to school yesterday .I didnt go to school yeaterday .4.肯定句中的some在否定句中应改为any 如：There are some students in the classroom. There are not any students in the classroom.将下列各句改成否定句1、 Toms brother is walking in the park._3、 The students of Class 5 are cleaning the classroom._5、 Tom and Mary are friends._7、There are some books in the bookcase._9、 Im a student._11、 Your father can ride a bike._13、 They can play football after school._16、 We come from China._19、 He likes the violin._20、 Have some bread, Tom._一般疑问句一般疑问句在英语的学习中，一般疑问句的转换及回答是经常碰到的问题，现在我们就来探讨一下有关一般疑问句的问题。 一、什么是一般疑问句 用Yes或No作答的疑问句叫一般疑问句。一般疑问句还有下列特点：1、以be动词、助动词或情态动词开头；例：Is your father a teacher? Does she like animals? Can Jenny speak Chinese?2、往往读升调；3、译成汉语，都可以带上“吗”，例如上面三句可分别译为：你父亲是老师吗？她喜欢动物吗？Jenny会说英语吗？ 二、例何将陈述句变成一般疑问句？ 要将陈述句变成一般疑问句，可以遵循下列步骤： 1.看句中有没有be动词（am、is、 are、 was、 were）、和情态动词（can、must、will、may等），如果有，将其提到句首，句末打上问号即可。 例 ： She is a girl. Is she a girl? Toms father can play the piano. Can Toms father play the piano? 练习：1.This is a boy2.It is a cat .3.This is your sister.4.Those are my books.5.These are apples.2.如果句中没有be动词、助动词或情态动词，则根据谓语动词的形式借助do的相应形式放在句首。具体方法是：如果谓语动词是原形或者主语是第一人称、第二人称、第三人称复数则借do；如果谓语动词是一般现在时第三人称单数形式，则借does； 需要注意的是，借does后，原句的谓语动词要变回原形。 例：They go to school by bike. Do they go to school by bike? Bill gets up at 6:30 every day. Does bill get up at 6:30 every day?练习：1.I love my parents. 2.I play computer games every night.3.I have a TV.三.陈述句变一般疑问句应注意的事项 陈述句变成一般疑问句除了遵循上述规则以外，还应注意下列几点： 1.如果陈述句中有第一人称，则变问句时最好要变为第二人称。例：I usually have lunch at school. Do you usually have lunch at school? My father is playing soccer. Is your father playing soccer? 2.如果陈述句中有some, 则变问句时往往要变成any 。 例： There is some water on the playground. Is there any water on the playground. 3如果句中含有实义动词have且表示“有”时,除借do外，也可将其直接提到句首。 例：I have some friends in America. Have you any friends in America?/Do you have any friends in America?综合练习：1. His father is an English teacher. 2. These cats are crying. 3. They can swim. 4. I like to read English.