肯定句变否定句

注意：句中有 some,一般要改为 any.
1.I can swim. → I can not swim. 2.You will go to the park. → You will not go to the park. 3. Peter need go home now. Peter need not go home now
肯定句变否定句 练一练
1. I am your friend. _____________________________ 2. My mother is a worker. _____________________________ 3. There are some books on the bookshelf. _____________________ 4. I was at home yesterday. _____________________________ 5. They were in Beijing ten years ago. _________________________ 6.Lucy will be back in a week. ______________________
肯定句变否定句
1.I am a student. → I am not a student. 2.You are sad. → You are not sad. 3. She is a good girl. → She is not a good girl. 4.Yesterday was Monday. → Yesterday was not Monday. 5.They were busy yesterday. → They were not busy yesterday.
7.She can sing a song and draw a picture. _____________________________ 8. Peter need go home tomorrow. _____________________________ 10. We come from China. _ _____________________________ 11.He likes the violin. _____________________________ 12. Peter did lots of work last night. __________________________
肯定祈使句变否定祈使句，也是 在动词前加直接don't. 3. Have some bread, Tom. Don't have any bread ,Tom. 4. Please open your books. Please don't open your books.
②当句中的动词是第三人称单数时， 在动词前加doesn’t ，动词还原原形。 She likes singing. → She doesn’t like singing. She does her homework. → She doesn’t do her homework.
1. He is a boy. He is not a boy. 2. I am your friend. I am not your friend. 3. My sister is a beatiful girl. My sister is not a beatiful girl.
5.There are some books on the bookshelf. There are not any books on the bookshelf. 6. I was at home yesterday. I was not at home yesterday. 7. They were in Beijing ten years ago. They were not in Beijing ten years ago.
肯定变否定,其实并不难，抓住动词是关键。 Be动词，首先看，有它在，not放在它后面。 Can,may,must,should,need,will,不一般， Not加在它后面。 以上这些都不见，你就应该小心点， Don’t站在动原前， Doesn’t站在单三前， Didn’t站在过去式前， 小心注意有一点， 要把动词变一变， 变回原型才全面. 这样说一说，你看难不难？ 唉！不难！不难！真不难！
1.如果句中有be动词 （ is, am , are, was, were),就在be动词后 面直接加not。
Fra Baidu bibliotek
be 动词和not的缩写形式： is not = isn't are not = aren't was not = wasn't were not = weren't 注意：am not 不能缩写。
3.如果句中没有be动词，也 没有情态动词，就 要借助（don’t, doesn’t, didn’t）来帮忙。
①当句中的动词是原形 时，在动词前直接加 don’t。 I like English. → I don't like English. You have dinner. → You don't have dinner.
4. You should open your book. You should not open your book. 5. He must finish his homework. He must not finish his homework.
2.如果句中有 （can ,may,must,should , need, will等），就在这些单 词后面直接加not。
can not = can't must not = mustn't should not = shouldn't need not = needn't will not = won't
1. Lucy will be back in a week. Lucy won't be back in a week. 2. You can use the dictionary. You can't use the dictionary. 3. Peter need go home now. Peter needn't go home now . 4. You should say “Sorry”. You shouldn't say “Sorry”. 5. He must stay at home . He mustn't stay at home .
③当句中的动词是过去式时,在动 词前加didn’t，动词还原原形。 We had a great time last year.→ We didn't have a great time last year. I went to school yesterday. → I didn't go to school yesterday.