肯定句变成否定句
肯定句变否定句口诀

肯定句变否定句的口诀如下:
改前面,加not;
含实义的词,直接变否定;
变be动词、助动词,not后面;
变have 与 do ,在前面加don't 。
如前所述,根据这个口诀,我们可以通过以下步骤将肯定句转变为否定句:
1. 若句子中没有情态动词,可直接在句子前加not,例如:He is a doctor.(他是一名医生。
)-> He is not a doctor.(他不是一名医生。
)
2. 若句子含有情态动词,直接将情态动词后面的动词原形变为动词的否定形式,例如:She can swim.(她会游泳。
)-> She cannot swim.(她不会游泳。
)
3. 当句子中含有be动词时,将be动词后面的动词原形变为动词的否定形式,并在be动词前加not,例如:They are happy.(他们很开心。
)-> They are not happy.(他们不开心。
)
4. 当句子中含有have或do时,将have或do变为其否定形式(has变为hasn't,do变为don't),例如:I have a pen.(我有一支钢笔。
)-> I don't have a pen.(我没有一支钢笔。
)
需要注意的是,对于助动词have和do,它们的否定形式是通过在前面加上don't来表示否定,而对于be动词来说,它的否定形式是通过在be动词后面加not来表示否定。
如何将肯定句改为否定句

如何将肯定句改为否定句方法一谓语动词是be、have(作“有”讲) ,或谓语动词有助动词、情态动词时,在它们的后面加not。
若句中有some时,需将some改为any。
例如:I have some books on this subject.→I have not any books on this subject.He can speak English.→He cannot speak English.方法二当谓语动词是行为动词时,而句中又没有情态动词或助动词时,需要在谓语动词之前加do not (或did not) 来构成否定句。
例如:I know something about it.→ I don’t know anything about it.方法三否定由think、believe、know等动词引出的宾语从句时,应将主句改为否定形式。
例如:She knows why the train is late.→She doesn’t know why the train is late.方法四祈使句的否定形式是在谓语动词前直接加do not。
例如:Read in bed.→Don’t read in bed.方法五如果肯定句是特殊句型,则要具体问题具体分析:陈述句中含有had better时,变为否定句时,要把not加在better后。
例如:You had better go with me.→You had better not go with me.陈述句中含有both (all) of +名词作主语时,改为否定句时,要用neither 来代替both,none代替all。
并注意谓语动词数的变化。
例如:Both of them are Americans.→Neither of them is American.。
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_. .
初中英语肯定句变否定句

初中英语肯定句变否定句
初中英语肯定句变否定句的方法有以下几种:
1. 直接在be 动词后加not。
如:He is a student. 变为He is not a student.
2. 借助助动词do/does/did,在其后加not。
如:I like English. 变为
I do not like English.
3. 实义动词前加助动词do/does/did 的否定形式,后接动词原形。
如:She goes to school by bike. 变为She doesn't go to school by bike.
4. 祈使句变否定句,一般在句首加Don't。
如:Open the door. 变为Don't open the door.
5. there be 句型的否定句,在be 动词后加not。
如:There is a book on the desk. 变为There is not a book on the desk.
需要注意的是,根据句子的不同情况选择不同的方法,同时还要注意句子的时态和人称等变化。
肯定句变否定句的基本方法

肯定句变否定句的基本方法一、动词be 的否定式动词be根据不同的人称和时态可以有am, is, are, was, were等不同形式,可用作连系动词(表示“是”、“在”等)和助动词(用于构成进行时态和被动语态等),但不管何种情况,构成否定式时,一律在其后加notI’m old, but you’re young. 我老了,但你还年轻。
→I’m not old, but you’re not young. 我还不老,但你不年轻了。
He was reading and I was writing. 他在读,我在写。
→He was not reading and I was not writing. 他没有在读,我没有在写。
二、动词have 的否定式动词have根据不同的人称和时态可以有have, has, had等形式,可以用作实意动词和助动词,分以下情况讨论1. 用作实意动词表示状态,如表示拥有、患病或用于have to表示“必须”等,在构成否定式时可以直接在其后加not,也可根据情况在其前使用don’t, doesn’t, didn’tHe has a car. 他有辆小汽车。
→He hasn’t a car. / He doesn’t have a car. 他没有小汽车。
He had some dictionaries. 他有一些词典。
→He hadn’t any dictionaries. / He didn’t have any dictionaries. 他没有词典。
You have to go with him. 你必须同他一起去。
→You haven’t to go with him. / You don’t have to go w ith him. 你不必同他一起去。
【注】have to构成否定式时以在其前加don’t等较为常见。
2. 用作实意动词表示动作,如表示“吃(=eat)”、“喝(=drink)”、“拿(=take)”、“收到(=receive)”、“度过(=spend)”等,构成否定式时不能直接在其后加not,而应根据情况在其前使用don’t, doesn’t, didn’tHe had some cake for breakfast. 他早餐吃了些蛋糕。
肯定句改否定句的方法

肯定句改否定句的方法
肯定句改为否定句有以下几种方法:
1. 在主语前加上否定词“不”。
例如:他去了超市。
→他不去了超市。
2. 在动词前加上否定词“不”。
例如:我喜欢吃巧克力。
→我不喜欢吃巧克力。
3. 在句子中其他位置加上否定词“不”。
例如:这个菜很好吃。
→这个菜不很好吃。
需要注意的是,有些动词需要使用“不”和“没”来表示否定,例如“吃”和“喝”等动词就需要用“不”表示否定,“没”表示否定的次数或状态。
例如:我今天没吃早饭。
(表示我今天没有吃早饭);我不喜欢喝咖啡。
(表示我不喜欢喝咖啡)
还有一种方法是使用含有否定意义的词语组成否定句。
例如:没有、不是、不会等。
例如:我没有去过北京。
(表示我从未去过北京);他不是我的同学。
(表示他不是我的同学);我不会说英语。
(表示我不会说英语)
以上是肯定句改为否定句的常用方法。
需要注意的是,句子的语境和语气也可能影响否定句的表达方式。
英语肯定句变否定句的方法

英语肯定句变否定句的方法摘要:一、英语肯定句变否定句的常用方法二、具体转换步骤和实践示例正文:英语肯定句和否定句在表达上有着明显的区别。
在英语中,否定句通常用来表示对某个陈述或观点的否认。
要将从肯定句转换为否定句,有以下几种常用方法。
首先,在句子前加“no”,这是最直接的方法。
例如,原句为“She is a teacher.”,转换为否定句就是“She is not a teacher.”。
其次,使用助动词“isn"t”、“aren"t”、“wasn"t”、“weren"t”等来替换原句中的动词。
例如,“They are playing soccer.”变为“They aren"t playing soccer.”接下来,我们可以利用“don"t”、“doesn"t”、“didn"t”等助动词替换疑问句中的动词。
例如,“He likes pizza.”变为“He doesn"t like pizza.”此外,还可以用“not...until...”的结构来表示否定。
例如,“I will go until it rains.”可以转换为“I will not go until it rains.”最后,需要注意的是,在转换过程中,要确保句子的语法结构和意思保持不变。
例如,“He has finished his homework.”转换为否定句就是“He hasn"t finished his homework.”总之,掌握以上方法,就可以轻松地将英语肯定句转换为否定句。
在实际应用中,根据不同的语境和句子结构,选择合适的方法进行转换,使句子更加丰富和生动。
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 not a 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.如:Put them over there.→Don't put them over there.Let us go home.→Let us not go home.或Don’t let us go home.4.主从复合句中,主句是I think,I believe等结构,变否定句时,形式上否定主句,实际上否定从句.如:I don't think chickens can swim .我认为鸡不会游泳. 5.“had better +动词原形”,变否定句时为“had better not +动词原形”。
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注意:
在肯定句中的some变成否定句时要变成any。 例如:We have some books. We don't have any books. There are some birds in the tree. There aren't any birds in the tree.
把下列句子变成否定句。
肯定句变成否,is,are)动词:
变否定句直接在be(am,is,are)词后加not。 如:am not, is not, are not; 例如:I am a teacher. I am not a teacher. She is tall and thin. She isn't tall and thin. They are students. They aren't students.
Thank
you!
1.I'm a student. 2.Your father can ride a bike. 3.There are some books in the bookcase. 4.We come from China. 5.He likes the violin. 6.Have some bread ,Tom. 7.Tom and Mary are friends. 8.His mother is a farmer. 9.They can play football after school. 10.She has some storybooks.
3、如果没有be动词和情态动词的:
句子是一般现在时的,如果主语是第一、二人称和第三人称 复数形式,或者主语是复数的,变否定句是在动词前面加助动词的 否定形式(don't)。 例如:I like red. I don't like red. You have a new bike. You don't have a new bike. They like storybooks. They don't like storybooks. The boys play football on the playground. The boys don't play football on the playground.
2、如果句子中含有情态动词 (can,should,will等)的:
变否定句时直接在情态动词(can,should,will)后加 not。 如:can not,should not, will not; 例如:He can swim. He can't swim. I will go to park tomorrow. I will not go to park tomorrow.
答案:
1.I'm not a student. 2.Your father can't ride a bike. 3.There aren't any books in the bookcase. 4.We don't come from China. 5.He doesn't like the violin. 6.Don't have any bread ,Tom. 7.Tom and Mary aren't friends. 8.His mother isn't a farmer. 9.They can 't play football after school. 10.She doesn't have any storybooks.
在一般现在时中,如果主语是第三人称单数 (he,she,it)或者人名时,变否定句是在动词前面加 上助动词的否定形式(doesn't),并且动词变回原形。
例如:He has a new pen. He doesn't have a new pen . She reads books every day. She doesn't read books every day. It wants to eat meat. It doesn't want to eat meat. Mary goes to school on foot. Mary doesn't go to school on foot.