英语,句子怎么变否定句?如题.最好带上例子

英语,句子怎么变否定句?如题.最好带上例子
英语,句子怎么变否定句?
如题.最好带上例子

英语,句子怎么变否定句?如题.最好带上例子
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.

举例说明
1. He is a teacher ---He isn't a teacher
2.I am a teacher ---I am not a teacher
3. You are tall ---You aren't tall
4 He works hard ---He doesn't work hard
5 I word hard --...

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举例说明
1. He is a teacher ---He isn't a teacher
2.I am a teacher ---I am not a teacher
3. You are tall ---You aren't tall
4 He works hard ---He doesn't work hard
5 I word hard ---I don't work hard
6. He will do it now ---He won't do it now
7.He has come back --He hasn't come back
8. They have finished the work ---They haven't finished the work
9. He mustn't step into the door
10. You needn't do it now
11 I can't do it myself

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1. 主系表结构的句子，只需在系动词加not。如：He is\ wasa teacher --- He isn't\ wasn`t a teacher .
2. 主谓宾结构的句子，根据时态和人称用助动词适当形式加 not 。如：
He\ she works hard ---He doesn't work hard .一般现在时态的第三人称单数，注意用 doesn't ...

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1. 主系表结构的句子，只需在系动词加not。如：He is\ wasa teacher --- He isn't\ wasn`t a teacher .
2. 主谓宾结构的句子，根据时态和人称用助动词适当形式加 not 。如：
He\ she works hard ---He doesn't work hard .一般现在时态的第三人称单数，注意用 doesn't 其后动词要还原成原形。
They\ We \ you work hard -- They\ We \ you don't work hard 。
They\ We \ you\ He\ she worked hard -- They\ We \ you\ He\ she didn't work hard .
一般过去时态，注意用 didn't ， 其后动词要还原成原形。
3. 主语﹢情态动词﹢动词原形﹢句子其它成分。只需在情态动词后加 not 。如：
He\ she\ we\ you\ They will(must,can,may,need,shall, shoud..) do it now ---He\ she\ we\ you\ They won't (must not,can not,may not,need not ,shall not, shoud not..)do it now .
4. 主语﹢has\have\had﹢done﹢句子其它成分.只需在has\have\had后﹢not。如：
He has come back -- He hasn't come back
They have finished the work ---They haven't finished the work
We had finished the work before yesterday.---We hadn't finished the work before yesterday.

收起

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.<...

全部展开

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

收起