幹千翻
must 有非推測性用法和推測性用法兩種情態意義，變否定句的方法不同。
▲非推測性用法的must表示義務，情態意義為“必須”。
He must finish his homework before bedtime. 他必須在上床前寫完作業。
此用法的must兩種否定形式：
1. 結構上否定：在must改為must not或mustn't，情態意義為“不許”。
He mustn't finish his homework before bedtime. 不許他在上床前寫完作業。
2. 意義上否定：將must改為need not或needn't，情態意義為“不必”。
He needn't finish his homework before bedtime. 他不必在上床前寫完作業。
▲推測性用法的must表示必然，情態意義為“肯定”。
He must finish his homework before bedtime. 他肯定在上床前寫完作業。
此用法的否定形式為can't，情態意義為“不可能”。
He can't finish his homework before bedtime. 他不可能在上床前寫完作業。
句子裏有must的句子怎麼改成否定句
must 有非推測性用法和推測性用法兩種情態意義，變否定句的方法不同。
▲非推測性用法的must表示義務，情態意義為“必須”。
He must finish his homework before bedtime. 他必須在上床前寫完作業。
此用法的must兩種否定形式：1. 結構上否定：在must改為must not或mustn't，情態意義為“不許”。
He mustn't finish his homework before bedtime. 不許他在上床前寫完作業。
2. 意義上否定：將must改為need not或needn't，情態意義為“不必”。
He needn't finish his homework before bedtime. 他不必在上床前寫完作業。
▲推測性用法的must表示必然，情態意義為“肯定”。
He must finish his homework before bedtime. 他肯定在上床前寫完作業。
此用法的否定形式為can't，情態意義為“不可能”。
He can't finish his homework before bedtime. 他不可能在上床前寫完作業。
must肯定句變否定句如何變
以下是used to構成疑問和否定的詳細講解和例句：used to作為情態動詞，可直接在used後加not構成否定式，直接將used置於句首構成疑問式，但與一般的情態動詞不同的，它也可像普通動詞那樣借助助動詞did構成否定式和疑問式：He usedn't 〔didn't use〕 to come. 他過去不常來。
You used to go there, usedn't 〔didn't〕 you？ 你過去常到那兒去，是嗎？Where did you use to live？ 你過去是住哪兒的？【注】在現代英語中，used to的否定式和疑問式通常借助助動詞did構成（特別是在口語和非正式文體中），而直接將used作為助動詞用通常被認為是非常正統或過時的用法。
然而有趣的是，有時還可見到以下這種混合形式：Did you used to be a teacher？ 你過去是當老師的嗎？They didn't used to live here. 他們過去沒住在這兒。
英語教師高中團隊真誠解惑
改句子：1.You must (eat some biscuits.)改為否定句,對括號裏提問
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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~祝你學習進步，更上一層樓！不明白請及時追問，滿意敬請采納，O（∩_∩）O謝謝~~
一般現在時怎樣變否定句
一般現在時變否定句的規則. （a） 含有 am is are 的句子，變否定句時， 隻需在am is are 後加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) 含有實義動詞的句子，變否定句分兩步。
（1）如果主語是第三人稱單數時，要在實義動詞前加doesn't，後麵的動詞用原形。
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) 如果主語不是第三人稱單數時，隻 需在實義動詞前加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) 含有情態動詞的句子，變否定句時， 隻需在情態動詞後加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：當must be用來表示推測，有“一定”的含義時， 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：當“must+行為動詞”用來表示“必須”的含義時， 其否定式可用needn't 或mustn't表示“不需要”，“不必”， 語氣委婉，must not表示“禁止”，“千萬別”語氣生硬。
例6 You may come in now. You mustn't come in now. 析：may作為情態動詞表示“可以”時， 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） 見到some 變否定句時，要換成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) 見到and 變否定句時，要換成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) 見到too和also變否定句時，要換成either. 例1Tom goes to school too. 否定句 Tom doesn't go to school either. too和also用於肯定句中時，否定句中用either替換。
（4 見到already變否定句時，要換成yet。
例1 He has had supper already. He hasn't had supper yet. 隨著對謂語動詞的否定，某些副詞也要作相應的變動。
把下來句子變成否定句和一般疑問句,再回答（肯定回答和否定回答）....
1.否定句：he doesn't have four pens 疑問句：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肯定句變否定句：1，句中如果有am,is are,must,can,could,may,might,shall,should,will,would，在後麵+not,2.句中如果有used to,ought to，在to前麵+not 3.句中如果沒有上述的詞語，第一，第二人稱和第三人稱複數（I,we,you,they,Tom's family等）在人稱後用don't，第三人稱單數（he,she,TOM等）在人稱後用doesn't，動詞還原（如plays-play）4.當然還有need,dare等可做情態動詞，可做實意動詞的詞，根據實際情況判斷，如果是情態動詞就用第二種，是實意動詞用第三種肯定句變一般疑問句：1.變一般疑問句時，所有一人稱（I,we,you and me又要變成二人稱）2，句中如果有am,is are,must,can,could,may,might,shall,should,will,would，將他們提前至句首3.句中如果有used to,ought to，分別將used,ought提前至句首4.句中如果沒有上述的詞語，第一，第二人稱和第三人稱複數（I,we,you,they,Tom's family等）將do提前至句首，第三人稱單數（he,she,TOM等）將does提前至句首，（如plays-play）5.當然還有need,dare等可做情態動詞，可做實意動詞的詞，根據實際情況判斷，如果是情態動詞就用第二種，是實意動詞用第三種
英語,句子怎麼變否定句？
先看句子裏有沒有be動詞（am,is,are）、情態動詞（can,may,would），如果有，在這些詞後麵直接加not如果沒有，就在謂語動詞前加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.
沒有be動詞的句子變為否定句怎麼變？
英語中，肯定句改為否定句，首先找一下be動詞，如果有直接在這些詞後加not如果沒有be ，有情態動詞，直接在情態動詞後加not如果上麵兩者都沒有，就看謂語動詞，如果是三單就加doesn't 再加動詞原形，如果是原形就用don't就行了ps如果有some變否定時要變為any
一般現在時怎樣變否定句
一般現在時變否定句的規則：（a） 含有 am is are 的句子，變否定句時，隻需在am is are 後加not.例：This is a book.否定句：This is not a book .(b) 含有實義動詞的句子，變否定句分兩步.（1）如果主語是第三人稱單數時，要在實義動詞前加doesn't，後麵的動詞用原形.例：He eats an apple.否定句：He doesn't eat an apple.(2) 如果主語不是第三人稱單數時，隻需在實義動詞前加don't.例：I teach English.否定句 I don't teach English.(c) 含有情態動詞的句子，變否定句時，隻需在情態動詞後加not.例：I can dance.否定句 I can not dance.或 I can't dance.析：當must be用來表示推測，有“一定”的含義時，否定式要用can not.例：You must say something at the mecting.You needn't say anything at the mecting. 析：當“must+行為動詞”用來表示“必須”的含義時，其否定式可用needn't 或mustn't表示“不需要”，“不必”，語氣委婉，must not表示“禁止”，“千萬別”語氣生硬.例：You may come in now.You mustn't come in now. 析：may作為情態動詞表示“可以”時，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） 見到some 變否定句時，要換成any.例： I eat some apples.否定句 I don't eat any apples.(2) 見到and 變否定句時，要換成or.例：There is some air and water on the moon.否定句 There isn't any air or water on the moon.(3) 見到too和also變否定句時，要換成either.例：Tom goes to school too.否定句 Tom doesn't go to school either.too和also用於肯定句中時，否定句中用either替換.（4 ）見到already變否定句時，要換成yet.例：He has had supper already.He hasn't had supper yet.隨著對謂語動詞的否定，某些副詞也要作相應的變動.
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