变否定句规则
变否定句规则
变否定句规则一、一般现在时变否定句的规则。
（a) 含有am is are 的句子，变否定句时, 只需在am is are 后加not.例1 This is a book.否定句This is not a book 。
例2 I am a teacher .否定句I am not a teacher .例3 These are pens .否定句These are not pens 。
(b) 含有实义动词的句子,变否定句分两步.（1)如果主语是第三人称单数时，要在实义动词前加doesn’t,后面的动词用原形。
例1 He eats an apple.否定句He doesn’t eat an apple。
例2 Jim does his homework.否定句Jim doesn't do his homework.例3 Marry goes to school。
否定句Marry doesn't go to school。
(2）如果主语不是第三人称单数时,只需在实义动词前加don't.例1 I teach English。
否定句I do n’t teach English。
例2 They go to school.否定句They don't go to school。
例3 We sing a song。
否定句We don't sing a song.（c) 含有情态动词的句子,变否定句时,只需在情态动词后加not。
例1 I can dance.否定句I can not dance. 或I can't dance.例2 They can speak English.否定句They can not speak English。
或They can't speak English.例3 He must go home。
否定句He must not go home。
重点语法含有be动词的句型转换肯定句变否定句
重点语法含有be动词的句型转换肯定句变否定句一、肯定句变否定句的基本原则在转换肯定句变否定句时，我们需要根据句子的结构和语法规律来进行相应的调整。
以下是一些常见的句型转换规则：1.句子结构为主语 + be动词 + 表语肯定句：主语 + be动词 + 表语否定句：主语 + be动词的否定形式（比如is not, am not, are not）+ 表语肯定句：She is a doctor.否定句：She is not a doctor.2.句子结构为主语 + be动词 + 表语 + 其他成分肯定句：主语 + be动词 + 表语 + 其他成分否定句：主语 + be动词的否定形式 + 表语 + 其他成分肯定句：They are studying English in the library.否定句：They are not studying English in the library.3.句子结构为主语 + be动词 + 其他成分肯定句：主语 + be动词 + 其他成分否定句：主语 + be动词的否定形式 + 其他成分肯定句：He is sleeping right now.否定句：He is not sleeping right now.二、特殊情况下的句型转换规则除了上述基本原则外，还有一些特殊情况需要特别注意。
1.当be动词为am时，否定形式为am not，而不是is not或are not。
肯定句：I am happy.否定句：I am not happy.2.当be动词为is时，否定形式为is not，而不是am not或are not。
肯定句：It is a beautiful day.否定句：It is not a beautiful day.3.当be动词为are时，否定形式为are not，而不是am not或is not。
肯定句：We are good friends.否定句：We are not good friends.通过上述规则和例子，我们可以清楚地了解如何将重点语法含有be动词的肯定句转换成否定句。
英语四个基本时态的 肯定句变否定句
_M_r_s_.__L_i_a_n_d__K_i_t_t_y__a_r_e__n_o__t_i_n__a_b__ig__s_h_o_p__. ________ .
8. He is crying（哭） under the tree.
____H__e_i_s_n__o_t__c_r_y_i_n_g_（__哭__）___u_n_d_e_r__t_h_e__t_r_e_e__. _____ .
9. His birthday is on the twentieth of November.
The old man doesn’t do morning exercises（早操） every morning.
23. We are from China.
_________W___e__a_r__e_n__’t__f__r_o_m___C__h_i_n_a__.________ .
24. He goes to the library（图书馆） on Sundays.
_____H_e__d_o_e_s_n_’_t__g_o_t_o__th__e_l_ib_r_a_r_y__o_n_S_u_n_d_a_y_s_.____ .
25. They have a class meeting every week.
_T_h__e_y_d__o_n_’t__h_a_v_e__a__c_l_a_s_s_m__e_e_t_i_n_g__e_v_e_r_y__w__e_e_k_. .
陈述句变否定句的规则
陈述句变否定句的规则1. 加上否定词：在陈述句中加上否定词，如"不"、"没有"、"无"、"非"等，来表示否定的意思。
例如：陈述句：他是个好学生。
否定句：他不是个好学生。
2. 改变动词形式：将陈述句中的动词改为否定形式。
例如：陈述句：他喜欢吃苹果。
否定句：他不喜欢吃苹果。
3. 加上反义词：在陈述句中加上表示相反意义的词语。
例如：陈述句：这个房间很干净。
否定句：这个房间不干净。
4. 改变句子结构：改变陈述句的句子结构，使其变为否定句。
例如：陈述句：她是一个聪明的学生。
否定句：没有一个学生聪明如她。
5. 加上条件状语从句：在陈述句中加上条件状语从句，表示不成立的条件。
例如：陈述句：如果他努力学习，他会考上大学。
否定句：如果他不努力学习，他不会考上大学。
6. 加上否定副词：在陈述句中加上否定副词，如"从未"、"决不"、"绝不"等，来表示否定的意思。
例如：陈述句：他总是按时完成任务。
否定句：他从未按时完成任务。
7. 改变句子代词：将陈述句中的代词改为否定形式。
例如：陈述句：我喜欢这本书。
否定句：我不喜欢那本书。
8. 加上否定前缀：在陈述句的形容词、名词前加上否定前缀，表示否定的意思。
例如：陈述句：这个问题很简单。
否定句：这个问题不简单。
9. 改变句子的否定形式：将陈述句改为否定形式，表示相反的意思。
例如：陈述句：他是一个优秀的演员。
否定句：他不是一个优秀的演员。
10. 加上否定连词：在陈述句中加上否定连词，如"但是不"、"然而不"等，表示相反的意思。
例如：陈述句：他虽然帅，但是没有才华。
否定句：他虽然帅，但是没有才华。
11. 加上表示否定的副词：在陈述句中加上表示否定的副词，如"不可能"、"不曾"、"绝不"等，表示否定的意思。
一般现在时变否定句的规则
一般现在时变否定句的规则.(a) 含有am is are 的句子,变否定句时,只需在am is are 后加not.例1 This is a book.否定句This is not a book .例2 I am a teacher .否定句I am not a teacher .例3 These are pens .否定句These are not pens .(b) 含有实义动词的句子，变否定句分两步。
（1）如果主语是第三人称单数时，要在实义动词前加doesn't,后面的动词用原形。
例1 He eats an apple.否定句He doesn't eat an apple.例2 Jim does his homework.否定句Jim doesn't do his homework.例3 Marry goes to school.否定句Marry doesn't go to school.(2) 如果主语不是第三人称单数时，只需在实义动词前加don't.例1 I teach English.否定句I don't teach English.例2 They go to school.否定句They don't go to school.例3 We sing a song.否定句We don't sing a song.(c) 含有情态动词的句子,变否定句时, 只需在情态动词后加not.例1 I can dance.否定句I can not dance.或I can't dance.例2 They can speak English.否定句 They can not speak English.或They can't speak English.例3 He must go home.否定句He must not go home.或He mustn't go home.例4 He must be on the playground.He can not be on the playground.析：当must be用来表示推测，有“一定”的含义时，否定式要用can not.例5 You must say something at the mecting.You needn’t say anything at the mecting.析：当“must+行为动词”用来表示“必须”的含义时，其否定式可用needn’t 或mustn't表示“不需要”，“不必”，语气委婉，must not表示“禁止”，“千万别”语气生硬。
肯定变否定
肯定句变否定句规则
（1）含有系动词be，变否定时，be后加not
（2）含有助动词have、has，变否定时，have、has后直接加not。
（3）含有情态动词can、may、must、will、shall，变否定时，直接加not
（4）句子谓语动词是实义动词时，若为动词原形，在其前加do not；若为动词的单三形式，把单三变为动词原
形，再在其前加does not；若动词为过去式，把过去
式变为原形，再在其前加did not。
（5）句子中含有all，both的句子变完全否定时，要将all →none，both→neither，both…and…→neither…nor…
要注意谓语动词的变化。
（6）现在完成时、过去完成时变否定时为have/has+not+done 和had+not+done。
（7）“had better do something”变否定时为“had better not do…”。
否定句的变化规则
否定句的变化规则一、含有be动词（am/is/are/was/were）的句子1. 规则- 直接在be动词后加not。
- 例如：- 肯定句：I am a student.- 否定句：I am not a student.- 肯定句：He is at home.- 否定句：He is not (isn't) at home.- 肯定句：They are happy.- 否定句：They are not (aren't) happy.- 肯定句：She was in the park yesterday.- 否定句：She was not (wasn't) in the park yesterday. - 肯定句：We were good friends last year.- 否定句：We were not (weren't) good friends last year.2. 注意事项- 在一般现在时中，am与第一人称I连用；is与第三人称单数（he/she/it 等）连用；are与第二人称you及复数（we/they等）连用。
- 在一般过去时中，was与第一人称I和第三人称单数（he/she/it等）连用；were与第二人称you及复数（we/they等）连用。
二、含有情态动词（can/could/may/might/must/should等）的句子1. 规则- 在情态动词后加not。
- 例如：- 肯定句：He can swim.- 否定句：He can not (can't) swim.- 肯定句：You could play football when you were young.- 否定句：You could not (couldn't) play football when you were young.- 肯定句：She may come tomorrow.- 否定句：She may not come tomorrow.- 肯定句：We must go to school on time.- 否定句：We must not (mustn't) be late for school.- 肯定句：You should study hard.- 否定句：You should not (shouldn't) waste your time.2. 注意事项- mustn't表示“禁止，不许”，有较强的命令语气。
一般现在时变否定句地规则
----一般现在时变否认句的规那么.(a)含有amisare的句子,变否认句时,只需在amisare后加not.例1Thisisabook.否认句Thisisnotabook.例2Iamateacher.否认句Iamnotateacher.例3Thesearepens.否认句Thesearenotpens.(b)含有实义动词的句子，变否认句分两步。
〔1〕如果主语是第三人称单数时，要在实义动词前加doesn't,后面的动词用原形。
例1Heeatsanapple.否认句Hedoesn'teatanapple.例2Jimdoeshishomework.否认句Jimdoesn'tdohishomework.例3Marrygoestoschool.否认句Marrydoesn'tgotoschool.(2)如果主语不是第三人称单数时，只需在实义动词前加don't.例1IteachEnglish.否认句Idon'tteachEnglish.例2Theygotoschool.否认句Theydon'tgotoschool.例3Wesingasong.否认句Wedon'tsingasong.(c)含有情态动词的句子,变否认句时,只需在情态动词后加not.例1Icandance.否认句Icannotdance.或Ican'tdance.例2TheycanspeakEnglish.否认句TheycannotspeakEnglish.或Theycan'tspeakEnglish.例3Hemustgohome.否认句Hemustnotgohome.或Hemustn'tgohome.例4Hemustbeontheplayground.Hecannotbeontheplayground.析：当mustbe用来表示推测，有“一定〞的含义时，否认式要用cannot.例5Youmustsaysomethingatthemecting.Youneedn’tsayanythingatthemecting.析：当“must+行为动词〞用来表示“必须〞的含义时，其否认式可用needn’t或mustn't表示“不需要〞，“不必〞，语气委婉，mustnot表示“制止〞，“千万别〞语气生硬。
英语 肯定句变为否定规则
一、简单句中含有be动词、情态动词和助动词时，变否定句时需在be动词、情态动词和助动词后加not。
1. （am, is ,are 是be动词）如：I am a teacher．→I am nota teacher．This is a pen.→ This is not a pen.或This isn’t a pen. (is not =isn’t) You are a boy. →You are not a boy. (are not =aren’t)2. （can是情态动词）He can help me．→He can not help me．或He can’t help me.(can not =can’t )3.当主语是第一人称、第二人称和第三人称复数时用助动词do,变否定时，在do后面加not 如：I like English .I do not like English.或I don’t like English.They go to school together. →They do not (don’t) go to school together.4.当主语是第三人称单数时用does,变否定时，在does后面加not，如：The little girl wants to go there.→ The little girl does not (doesn't ) want to go there．2．简单句中谓语动词为行为动词时，要根据时态选用do的相应形式，把肯定句变为否定句。
如：The little girl wants to go there．→The little girl doesn't want to go there．He did his work yesterday．→He didn't do his work yesterday．3．祈使句变否定句时，一般在句首加Don't，但Let us或Let's 开头的祈使句在Let us或Let's后加not也可。
一般现在时变否定句的规则
一般现在时变否定句的规则.(a) 含有am is are 的句子,变否定句时,只需在am is are 后加not.例1 This is a book.否定句This is not a book .例2 I am a teacher .否定句I am not a teacher .例3 These are pens .否定句These are not pens .(b) 含有实义动词的句子，变否定句分两步。
（1）如果主语是第三人称单数时，要在实义动词前加doesn't,后面的动词用原形。
例1 He eats an apple.否定句He doesn't eat an apple.例2 Jim does his homework.否定句Jim doesn't do his homework.例3 Marry goes to school.否定句Marry doesn't go to school.(2) 如果主语不是第三人称单数时，只需在实义动词前加don't.例1 I teach English.否定句I don't teach English.例2 They go to school.否定句They don't go to school.例3 We sing a song.否定句We don't sing a song.(c) 含有情态动词的句子,变否定句时, 只需在情态动词后加not.例1 I can dance.否定句I can not dance.或I can't dance.例2 They can speak English.否定句 They can not speak English.或They can't speak English.例3 He must go home.否定句He must not go home.或He mustn't go home.例4 He must be on the playground.He can not be on the playground.析：当must be用来表示推测，有“一定”的含义时，否定式要用can not.例5 You must say something at the mecting.You needn’t say anything at the mecting.析：当“must+行为动词”用来表示“必须”的含义时，其否定式可用needn’t 或mustn't表示“不需要”，“不必”，语气委婉，must not表示“禁止”，“千万别”语气生硬。
一般现在时变否定句的规则
一般现在时变否定句的规则.(a) 含有am is are 的句子,变否定句时,只需在am is are 后加not.例1 This is a book.否定句This is not a book .例2 I am a teacher .否定句I am not a teacher .例3 These are pens .否定句These are not pens .(b) 含有实义动词的句子，变否定句分两步。
（1）如果主语是第三人称单数时，要在实义动词前加doesn't,后面的动词用原形。
例1 He eats an apple.否定句He doesn't eat an apple.例2 Jim does his homework.否定句Jim doesn't do his homework.例3 Marry goes to school.否定句Marry doesn't go to school.(2) 如果主语不是第三人称单数时，只需在实义动词前加don't.例1 I teach English.否定句I don't teach English.例2 They go to school.否定句They don't go to school.例3 We sing a song.否定句We don't sing a song.(c) 含有情态动词的句子,变否定句时, 只需在情态动词后加not.例1 I can dance.否定句I can not dance.或I can't dance.例2 They can speak English.否定句 They can not speak English.或They can't speak English.例3 He must go home.否定句He must not go home.或He mustn't go home.例4 He must be on the playground.He can not be on the playground.析：当must be用来表示推测，有“一定”的含义时，否定式要用can not.例5 You must say something at the mecting.You needn’t say anything at the mecting.析：当“must+行为动词”用来表示“必须”的含义时，其否定式可用needn’t 或mustn't表示“不需要”，“不必”，语气委婉，must not表示“禁止”，“千万别”语气生硬。
一般现在时变否定句的规则
一般现在时变否定句的规则.(a)含有am is are 的句子,变否定句时,只需在am is are 后加not.例1 This is a book.否定句This is not a book .例2 I am a teacher .否定句I am not a teacher .例3 These are pens .否定句These are not pens .(b) 含有实义动词的句子，变否定句分两步。
（1）如果主语是第三人称单数时，要在实义动词前加doesn't,后面的动词用原形。
例1 He eats an apple.否定句He doesn't eat an apple.例2 Jim does his homework.否定句Jim doesn't do his homework.例3 Marry goes to school.否定句Marry doesn't go to school.(2) 如果主语不是第三人称单数时，只需在实义动词前加don't.例1 I teach English.否定句I don't teach English.例2 They go to school.否定句They don't go to school.例3 We sing a song.否定句We don't sing a song.(c) 含有情态动词的句子,变否定句时, 只需在情态动词后加not.例1 I can dance.否定句I can not dance.或I can't dance.例2 They can speak English.否定句They can not speak English.或They can't speak English.例3 He must go home.否定句He must not go home.或He mustn't go home.例4 He must be on the playground.He can not be on the playground.析：当must be用来表示推测，有“一定”的含义时，否定式要用can not.例5 You must say something at the mecting.You needn’t say anything at the mecting.析：当“must+行为动词”用来表示“必须”的含义时，其否定式可用needn’t 或mustn't表示“不需要”，“不必”，语气委婉，must not表示“禁止”，“千万别”语气生硬。
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.变否定句规则一、一般现在时变否定句的规则.(a) 含有am is are 的句子,变否定句时, 只需在am is are 后加not.例1 This is a book.否定句This is not a book .例2 I am a teacher .否定句I am not a teacher .例3 These are pens .否定句These are not pens .(b) 含有实义动词的句子，变否定句分两步。
（1）如果主语是第三人称单数时，要在实义动词前加doesn't,后面的动词用原形。
例1 He eats an apple.否定句He doesn't eat an apple.例2 Jim does his homework.否定句Jim doesn't do his homework.例3 Marry goes to school.否定句Marry doesn't go to school.(2) 如果主语不是第三人称单数时，只需在实义动词前加don't.例1 I teach English.否定句I don't teach English.例2 They go to school.否定句They don't go to school.例3 We sing a song. 否定句We don't sing a song.(c) 含有情态动词的句子,变否定句时,只需在情态动词后加not.例1 I can dance.否定句I can not dance. 或I can't dance.例2 They can speak English.否定句They can not speak English. 或They can't speak English.例3 He must go home.否定句He must not go home. 或He mustn't go home..例4 He must be on the playground.He can not be on the playground.析：当must be用来表示推测，有“一定”的含义时，否定式要用can not.例5You must say something at the mecting.You needn’t say anything at the mecting.析：当“must+行为动词”用来表示“必须”的含义时，其否定式可用needn’t 或mustn't表示“不需要”，“不必”，语气委婉，must not表示“禁止”，“千万别”语气生硬。
例6 You may come in now.You mustn't come in now.析：may作为情态动词表示“可以”时，其否定式用must not,而不用may not.例7 He may watch TV .He mustn't watch TV.注意:(1) 见到some 变否定句时,要换成any.例1 I eat some apples.否定句I don't eat any apples.例2 He has some books.否定句He doesn't have any books.例3 He does his home work.否定句He doesn't do his home work.(2) 见到and 变否定句时,要换成or.例1 There is some air and water on the moon.否定句There isn't any air or water on the moon.例2 He has some brothers and sisters.否定句He hasn't any brothers or sisters.例3 He eats apples and oranges.否定句He doesn’t eat apples or oranges.(3) 见到too和also变否定句时,要换成either.例1. Tom goes to school too.否定句Tom doesn’t go to school either.too和also用于肯定句中时，否定句中用either替换。
（4）见到already变否定句时,要换成yet。
例1 He has had supper already.He hasn’t had supper yet.随着对谓语动词的否定，某些副词也要作相应的变动。
英语句型转换错误分析：肯定句变否定句1. I think she is there.误：I think she isn’t there.正：I don’t think she is there.析：英语中think, believe, expect, suppose等表示信念和揣测的动词，后接that从句时，习惯上将从句中的否定形式转移到主句上，即否定主句谓语，不否定从句谓语。
2. He can sing this song and that one.误：He can not sing this song and that one.正；He can not sing this song or that one.析：肯定句中的连词and在否定句中一般要改为or。
3. Tom went to school too.误：Tom didn’t go to school too.正：Tom didn’t go to school either.析：too和also用于肯定句中时，否定句中用either替换。
4. He has had supper already.误：He hasn’t had supper alre ady.正：He hasn’t had supper yet.析：随着对谓语动词的否定，某些副词也要作相应的变动。
5. He had a good rest just now.误：He hadn’t a good rest just now.正：He didn’t have a good rest just now.析：have在表示开会、吃饭、休息、进行体育锻炼等词组中是行为动词，否定句用助动词来完成。
6. Le t’s do it.误：Let’s don’t do it.正：Don’t let’s do it.或Let’s not do it.析：let后接的是不带to的不定式，变为否定式，直接在句首前加Don’t或在不定式前加not。
7. He always gets there on time.误：He doesn’t always get there on time.正：He never gets there on time.析：He doesn’t always get there on time意为“他并非老是准时到那儿”，是部分否定，习惯上把句中的副词改为相应的表示否定的副词即可。
如：It often rains here. It seldom rains here.8. Be here early tomorrow.误：Be not here early tomorrow.正：Don’t be here early tomorrow.析：祈使句的否定，一般在谓语动词前加do not的缩写don’t。
9. You had better come.误：You didn’t have better come.正：You had better not come.析：had better相当于一情态动词，不可分割，因此not应放在其后。
would rather也是如此。
10. Both Tom and Xiao Ping went to school.误：Both Tom and Xiao Ping didn’t go to school.正：Neither Tom nor Xiao Ping went to school.析：一个句子中如果有不定代词both，all, every改为否定式时，要把这些不定代词改为相应的表示否定的代词。
二一般过去时变否定句规则(a) 含有was were 的句子,变否定句时,只需在was were 后加not.例1 This was a book.否定句This was not a book . 或This wasn't a book .例2 I was a teacher .否定句I was not a teacher . 或I wasn't a teacher .例3 These were pens .否定句These were not pens .或These weren't pens(b) 含有实义动词过去式的句子，变否定句时，只需在实义动词过去式前加didn't，后面的动词用原形。
例1 He ate an apple.否定句He didn't eat an apple.例2 Jim did his homework.否定句Jim didn't do his homework.例3 Marry went to school.否定句Marry didn't go to school.(c) 含有情态动词过去式的句子,变否定句时,只需在情态动词过去式后加not.(can could,may might ,need need ,must must)例1 I could dance.否定句I could not dance.或I couldn’t dance.例2 They could speak English.否定句They could not speak English.或They couldn’t speak English.例3 He could swim,so can I.He could swim,neither(nor)can I析：在“陈述句+so+助（系情态）动词+主语”结构中，若改为否定句，除陈述部分加副词not外，还需将so改为neither或nor。
例4 He must go home.否定句He must not go home.或He mustn't go home.例5 He must be on the playground.He could not be on the playground..析：当must be用来表示推测，有“一定”的含义时，否定式要用can not.例6 You must say something at the mecting.You needn’t say anything at the mecting.析：当“must+行为动词”用来表示“必须”的含义时，其否定式可用needn’t 或mustn't表示“不需要”，“不必”，语气委婉，must not表示“禁止”，“千万别”语气生硬。