句子里有must的句子怎么改成否定句

must 有非推测性用法和推测性用法两种情态意义，变否定句的方法不同。

▲非推测性用法的must表示义务，情态意义为“必须”。

He must finish his homework before bedtime. 他必须在上床前写完作业。

此用法的must两种否定形式：

1. 结构上否定：在must改为must not或mustn't，情态意义为“不许”。

He mustn't finish his homework before bedtime. 不许他在上床前写完作业。

2. 意义上否定：将must改为need not或needn't，情态意义为“不必”。

He needn't finish his homework before bedtime. 他不必在上床前写完作业。

▲推测性用法的must表示必然，情态意义为“肯定”。

He must finish his homework before bedtime. 他肯定在上床前写完作业。

此用法的否定形式为can't，情态意义为“不可能”。

He can't finish his homework before bedtime. 他不可能在上床前写完作业。

句子里有must的句子怎么改成否定句

must 有非推测性用法和推测性用法两种情态意义，变否定句的方法不同。

▲非推测性用法的must表示义务，情态意义为“必须”。

He must finish his homework before bedtime. 他必须在上床前写完作业。

此用法的must两种否定形式：1. 结构上否定：在must改为must not或mustn't，情态意义为“不许”。

He mustn't finish his homework before bedtime. 不许他在上床前写完作业。

2. 意义上否定：将must改为need not或needn't，情态意义为“不必”。

He needn't finish his homework before bedtime. 他不必在上床前写完作业。

▲推测性用法的must表示必然，情态意义为“肯定”。

He must finish his homework before bedtime. 他肯定在上床前写完作业。

此用法的否定形式为can't，情态意义为“不可能”。

He can't finish his homework before bedtime. 他不可能在上床前写完作业。

must肯定句变否定句如何变

以下是used to构成疑问和否定的详细讲解和例句：used to作为情态动词，可直接在used后加not构成否定式，直接将used置于句首构成疑问式，但与一般的情态动词不同的，它也可像普通动词那样借助助动词did构成否定式和疑问式：He usedn't 〔didn't use〕 to come. 他过去不常来。

You used to go there, usedn't 〔didn't〕 you？ 你过去常到那儿去，是吗？Where did you use to live？ 你过去是住哪儿的？【注】在现代英语中，used to的否定式和疑问式通常借助助动词did构成（特别是在口语和非正式文体中），而直接将used作为助动词用通常被认为是非常正统或过时的用法。

然而有趣的是，有时还可见到以下这种混合形式：Did you used to be a teacher？ 你过去是当老师的吗？They didn't used to live here. 他们过去没住在这儿。

英语教师高中团队真诚解惑

改句子：1.You must 改为否定句,对括号里提问

你好1. You can't eat any biscuits.2. How do the pupils go to Shanghai Library3. Where does the giraffe live?4. Which butterfly do you like?5. She gets up at half past six in the morning6. My mom has lunch as home/7. Which floor does Mr Green live on?8. Both Tom and Peter like eating carrots.9. Does John's brother usually have breakfast at home?No. he doesn't10. Don't smoke here/11. What's the wooden bed made of?12. Which blouse does your sister like?13. Because dangerous14. Which umbrella does Tom want?15. Which hat does Peter like?16. You mustn't ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~祝你学习进步，更上一层楼！不明白请及时追问，满意敬请采纳，O（∩_∩）O谢谢~~

一般现在时怎样变否定句

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 . 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. 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. 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。

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. 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. 见到too和also变否定句时，要换成either. 例1Tom 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。

把下来句子变成否定句和一般疑问句,再回答（肯定回答和否定回答）....

1.否定句：he doesn't have four pens 疑问句：does he have four pens肯定回答：yes,he does否定回答：no,he doesn't2.Tom and I don't fly a kite every dayDO you fly a kite every dayyes,we dono,we don't3.Tom doesn't play computer gamesdoes Tom play computer gamesyes,he doesno,he doesn't4.we can't swim in the swimming poolcan you swim in the swimming poolyes ,we can no,we can't5.my mother isn't reading booksIS your mother reading booksyes,she isno,she isn't肯定句变否定句：1，句中如果有am,is are,must,can,could,may,might,shall,should,will,would，在后面+not,2.句中如果有used to,ought to，在to前面+not 3.句中如果没有上述的词语，第一，第二人称和第三人称复数（I,we,you,they,Tom's family等）在人称后用don't，第三人称单数（he,she,TOM等）在人称后用doesn't，动词还原（如plays-play）4.当然还有need,dare等可做情态动词，可做实意动词的词，根据实际情况判断，如果是情态动词就用第二种，是实意动词用第三种肯定句变一般疑问句：1.变一般疑问句时，所有一人称（I,we,you and me又要变成二人称）2，句中如果有am,is are,must,can,could,may,might,shall,should,will,would，将他们提前至句首3.句中如果有used to,ought to，分别将used,ought提前至句首4.句中如果没有上述的词语，第一，第二人称和第三人称复数（I,we,you,they,Tom's family等）将do提前至句首，第三人称单数（he,she,TOM等）将does提前至句首，（如plays-play）5.当然还有need,dare等可做情态动词，可做实意动词的词，根据实际情况判断，如果是情态动词就用第二种，是实意动词用第三种

英语,句子怎么变否定句？

先看句子里有没有be动词（am,is,are）、情态动词（can,may,would），如果有，在这些词后面直接加not如果没有，就在谓语动词前加don't,doesn't 或者didn't例如：He is a student. He isn't a student.She can fly a kite. She can't fly a kite.I go to school by bus. I don't go to school by bus.He likes to play football. He doesn't like to play football.

没有be动词的句子变为否定句怎么变？

英语中，肯定句改为否定句，首先找一下be动词，如果有直接在这些词后加not如果没有be ，有情态动词，直接在情态动词后加not如果上面两者都没有，就看谓语动词，如果是三单就加doesn't 再加动词原形，如果是原形就用don't就行了ps如果有some变否定时要变为any

一般现在时怎样变否定句

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：This is a book.否定句：This is not a book . 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：He eats an apple.否定句：He doesn't eat an apple. 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：I teach English.否定句 I don't teach English. 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：I can dance.否定句 I can not dance.或 I can't dance.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：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.例：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： 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： I eat some apples.否定句 I don't eat any apples. 见到and 变否定句时，要换成or.例：There is some air and water on the moon.否定句 There isn't any air or water on the moon. 见到too和also变否定句时，要换成either.例：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：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.