肯定句及祈使句变否定句
英语初中祈使句讲解及练习
中考初中英语祈使句讲解及练习初中英语――祈使句一、概念：祈使句指的是表示命令、请求、建议或劝告的句子。
二、句型结构：1、肯定句：2、否定句：1. 肯定的祈使句（1）动词原形+其他Stand up, please. = Please stand up. 请起立。
（2）Be + n./adj/prep短语.Be a good boy! 要做一个好孩子!Be careful! = Look out! = Take care! 小心 / 当心！（3）Let + 宾语 + 动词原形 + 其它成分Let me help you. 让我来帮你。
Let’s go to school together. 咱们一起上学去吧。
2. 否定的祈使句(1) Don't + 动词原形Don't stand up. 别站起来。
Don't be careless. 别粗心。
Don't let them play with fire. 别让他们玩火。
（2）Let型的否定式有两种:“Don't + let + 宾语 + 动词原形 + 其它成分”和“Let + 宾语 + not + 动词原形 + 其它成分”。
Don't let him go. / Let him not go. 别让他走。
Let them not play with fire. 别让他们玩火。
（3）no开头,用来表示禁止性的祈使句。
No smoking! 禁止吸烟!No fishing! 禁止钓鱼!No photos！三、练习一. 用括号内所给动词的适当形式填空。
1.It’s an important meeting. _________________ (not, be )late.2.________________ (not,make) any nise! Your mother is sleeping.3.________________ (not, speak) with your mouth full of food and _________ (be) polite.4. ________________ ( not, talk) and ____________ (read) aloud.5._______________ (not,leave) your homework for tomorrow, Larry.6.________________ (look) out! A car is coming.7._______________ (give) us ten years and just see what our country will be like.二、单项选择1. The TV is too loud. Please________. A.turn it down B. to turn it down C. turn down it D. to turn down it2. _______ late again, Bill!A. Don't to beB. Don't beC. Not beD. Be not3. _______ cross the road until the traffic lights turn green.A. NotB. Won'tC. Doesn'tD. Don't4. Please help me carry it, ______?A. will IB. will youC. shall ID. shall we5. Don't make so much noise, ______?A. will youB. won't youC. shall weD. do you6. Do you know the girl ______under the tree?A. standB. to standC. standingD. stood7. Kate, _______ your homework here tomorrow.A. bringB. bringsC. to bringD. bringing8. ________ me the truth, or I'll be angry.A. TellingB. To tellC. ToldD. Tell9. I've kept the dog _______Maomao for a long time.A. NameB. namedC. namingD. to name10. Don't you know that _______ is good for our health?A. swimB. swimmingC. swamD. swims11 .Her doctor said: “________ work so hard”A StopB Don’tC Can’tD No14. ________him the secret, will you?A Don’t tellB Not to tellC Not tellingD No telling15. ________ in bed. It’s bad for your eyes.A Not to readB Don’t readC Don’t to readD Not read16. ________ Your child. We’ll look after him.A Not to worry aboutB Don’t worry aboutC Not worry forD Don’t worry with20.Please ________ look outside. Look at the blackboard.A notB don’tC aren’tD can’t三、句型转换1. Will you please read it again more slowly? （改为祈使句）_______ ________ again more slowly, please.2. If you don't listen to me, I'll go. （改为同义句）________ ________me, or I’ll go.4. The teachers often tell the students not to be careless. （改为祈使句）_______ _______careless, please.5. Please sit next to Nancy. （改为否定句）_______ _______ next to Nancy.6. Don't forget to turn off the lights, please. （改为反意疑问句）Don't forget to turn off the lights, _______ _______?7. If you move, you'll die. （改为同义句）_______ ______, or you'll die.二、英语书面表达专项训练2．朋友是我们生活的组成部分，他们总是在我们最需要帮助的时候陪伴我们。
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_. .
祈使句
祈使句
祈使句：省略主语（you）用于表达命令、请求、劝告、警告、禁止的句子
1、do型祈使句
肯定：动原+其他listen to the teacher carefully.
否定：Don’t+动原+其他Don’t listen to the teacher carefully
do型祈使句口诀：do型祈使句，它的主语（you）常省去；
表示请求或命令，加上please表客气；
如果变成否定句，使用don’t是规律。
2、be型祈使句
肯定句：Be+形容词例： Be quiet. Be careful.
否定句：Don’t + be + 形容词例：Don’t be quiet.
3、No 型祈使句
No +名词/动名词
No pictures.（名词）禁止拍照。
例：No spitting. No littering. No parking.（禁止泊车）4、Let型祈使句
Let sb（宾语） do sth. 让某人做某事。
Let sb（宾语）not do sth 让某人不要做某事。
Let’s go to school.
Let’s not go to school.。
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。
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。
改为否定句的方法
改为否定句的方法在英语语法中，否定句是构成语法结构的重要部分。
通过将肯定句改为否定句，我们可以表达相反的意思，从而丰富语言表达方式。
下面将介绍一些常见的改为否定句的方法。
一、动词变否定。
1. be动词的否定形式。
be动词的否定形式是在be动词后面加not，例如：肯定句，She is a student.否定句，She is not a student.2. 助动词的否定形式。
助动词的否定形式是在助动词后面加not，例如：肯定句，He can speak English.否定句，He cannot speak English.3. 一般动词的否定形式。
一般动词的否定形式是在动词前面加do not或does not，例如：肯定句，They like playing basketball.否定句，They do not like playing basketball.二、副词的否定形式。
有些副词的否定形式是在词前加not，例如：肯定句，She usually goes to work by bus.否定句，She does not usually go to work by bus.三、形容词的否定形式。
形容词的否定形式是在词前加not，例如：肯定句，The movie is interesting.否定句，The movie is not interesting. 四、名词的否定形式。
名词的否定形式是在名词前加no，例如：肯定句，There is a book on the table.否定句，There is no book on the table. 五、句子的否定形式。
句子的否定形式是在句子前面加否定词，例如：肯定句，She will come to the party.否定句，She will not come to the party.六、疑问句的否定形式。
疑问句的否定形式是在疑问句前面加否定词，例如：肯定句，You have finished your homework.否定句，Have you not finished your homework?七、祈使句的否定形式。
[精品]把肯定句改成否定句
![[精品]把肯定句改成否定句](https://img.taocdn.com/s3/m/0cb8e8bcaff8941ea76e58fafab069dc51224752.png)
[精品]把肯定句改成否定句一、首先，要看肯定句中是否有情态动词，如果有情态动词，直接在情态动词后面加not即可，同时句中如果有some，some就要变成any。
举例如下：1、肯定句：Mike can help you solve the problem.译文：迈克可以帮你解决那个问题。
否定句：Mike can't help you solve the problem. (can't=can not)译文：迈克不能帮你解决那个问题。
2、肯定句：You should lend some money to Mary.译文：你应该借给玛丽一些钱。
否定句：You shouldn't lend any money to Mary. (shouldn't=should not)译文：你不应该借钱给玛丽。
二、如果肯定句中没有情态动词，那就要看句中有无be动词的相应形式，如果有，直接在be动词后面加not，句中有some，some变any。
举例如下：1、肯定句：I am an English teacher.译文：我是一名英语老师。
否定句：I‘m not an English teacher.译文：我不是一名英语老师。
2、肯定句：There are some books on the desk.译文：书桌上有一些书。
否定句：There aren't any books on the desk.译文：书桌上没有书。
三、如果肯定句中既没有情态动词，也没有be动词，那么就要用相应的助动词加上not来变换，句中有some，some变any。
举例如下：1、肯定句：She likes helping others.译文：她喜欢帮助别人。
否定句：She doesn't like helping others.译文：她不喜欢帮助别人。
2、肯定句：They have some apples.译文：他们有一些苹果。
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中考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 cannot sing this song and that one.
正；He cannot 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 already.
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. Let’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 doe sn’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。
中考句型转换错误分析肯定句变否定句
编辑：金子明点击数：1844次录入时间：2008/1/8 14:14:00 我要评论
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 cannot sing this song and that one.
正；He cannot 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 already.
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. Let’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。
祈使句如何变为否定句
一、一般情况
一般说来，祈使句的否定是在祈使句首加Don’t。
如：
(1)Come here. —Don’t come here. 不要来这儿。
(2)Be angry. —Don’t be angry. 不要生气
二、let型
当祈使句表示邀请或建议(Let’s…) 时，则在Let’s与do之间加not。
如：
(1)Let’s talk about it. —Let’s not talk about it. 我们别谈论它吧。
(2)Let’s go swimming there. —Let’s not go swimming there. 我们别去那里游泳吧。
三、无动词型
无动词祈使句的否定：在无动词祈使句的句首加not。
如：
(1)Here? —Not here. 不是这里。
(2)Green?—Not green. 不是绿色的。
(3)This one? —Not this one. 不是这个。