英语怎样做否定句，一般疑问句，对划线部分提问，有怎样的技巧，举几个例子
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一、否定句
1.主语+be动词+表语结构
变否定句，直接在be动词后面加个not就可以了。
Mr. White is a very good teacher.-->Mr. White is not a very good teacher.
2.主语+动词+其他
当此句为一般现在时，在动词之前加don't或doesn't（第三人称单数形式）,并将动词变为原形就可以了
He loves playing football with his friends.-->He doesn't love playing football with his friends.
当此句为过去时，在动词之前加didn't，并且把动词变为原形
Tom's sister graduated from high school last year.-->Tom's sister didn't graduate from high school last year.
3.主语+情态动词+动词+其他
在情态动词后面加not就可以了
I can drive a car.-->I cannot drive a car.
4.主语+have/has+动词过去分词+其他
在have/has后面加not就可以了
The students have done their homework.-->The students have not done their homework.
二、一般疑问句
1.主语+be动词+表语结构
变一般疑问句，把be动词提前，句子就变成 be动词+主语+表语结构？
Mr. White is a very good teacher.-->Is Mr. White a very good teacher?
2.主语+动词+其他
当句子为一般现在时，在句首加do或does，并且把动词变为原形，句子变成 Do/Does+主语+动词原形+其他？
He loves playing football with his friends.-->Does he love playing football with his friends?
句子为一般过去时，在句首加did，句子变成 Did+主语+动词+其他？
Tom's sister graduated from high school last year.-->Did Tom's sister graduate from high school last year?
3.主语+情态动词+动词+其他
将情态动词提前，句子变成 情态动词+主语+动词原形+其他？
I can drive a car.-->Can you drive a car?
4.主语+have/has+动词过去分词+其他
将have/has提前，句子变成have/has+主语+动词过去分词+其他
The students have done their homework.-->Have the students done their homework?
三、对划线部分提问
先找出划线部分在句子中所占得成分，找到对应的疑问词，将疑问词写在句首，再将原句变成一般疑问句，却掉划线的部分，写在疑问词后面就可以了。
Tom bought a new computer from the store yesterday.
若划线部分为Tom，Tom 是个人，且作主语，则疑问词应选Who， 此句应该为 Who bought a new computer from the store yesterday?
若划线部分为a new computer， 划线部分为物，则疑问词为what，此句应为 What did Tom buy from the store yesterday?
若划线部分为from the store,则疑问词应为Where，表示地点，此句应为 Where did Tom buy a new computer yesterday?
若划线部分为yesterday,则疑问词为When，表示时间，此句应为 When did Tom buy a new computer from the store?
希望对你有帮助~~~ ^^
1.主语+be动词+表语结构
变否定句，直接在be动词后面加个not就可以了。
Mr. White is a very good teacher.-->Mr. White is not a very good teacher.
2.主语+动词+其他
当此句为一般现在时，在动词之前加don't或doesn't（第三人称单数形式）,并将动词变为原形就可以了
He loves playing football with his friends.-->He doesn't love playing football with his friends.
当此句为过去时，在动词之前加didn't，并且把动词变为原形
Tom's sister graduated from high school last year.-->Tom's sister didn't graduate from high school last year.
3.主语+情态动词+动词+其他
在情态动词后面加not就可以了
I can drive a car.-->I cannot drive a car.
4.主语+have/has+动词过去分词+其他
在have/has后面加not就可以了
The students have done their homework.-->The students have not done their homework.
二、一般疑问句
1.主语+be动词+表语结构
变一般疑问句，把be动词提前，句子就变成 be动词+主语+表语结构？
Mr. White is a very good teacher.-->Is Mr. White a very good teacher?
2.主语+动词+其他
当句子为一般现在时，在句首加do或does，并且把动词变为原形，句子变成 Do/Does+主语+动词原形+其他？
He loves playing football with his friends.-->Does he love playing football with his friends?
句子为一般过去时，在句首加did，句子变成 Did+主语+动词+其他？
Tom's sister graduated from high school last year.-->Did Tom's sister graduate from high school last year?
3.主语+情态动词+动词+其他
将情态动词提前，句子变成 情态动词+主语+动词原形+其他？
I can drive a car.-->Can you drive a car?
4.主语+have/has+动词过去分词+其他
将have/has提前，句子变成have/has+主语+动词过去分词+其他
The students have done their homework.-->Have the students done their homework?
三、对划线部分提问
先找出划线部分在句子中所占得成分，找到对应的疑问词，将疑问词写在句首，再将原句变成一般疑问句，却掉划线的部分，写在疑问词后面就可以了。
Tom bought a new computer from the store yesterday.
若划线部分为Tom，Tom 是个人，且作主语，则疑问词应选Who， 此句应该为 Who bought a new computer from the store yesterday?
若划线部分为a new computer， 划线部分为物，则疑问词为what，此句应为 What did Tom buy from the store yesterday?
若划线部分为from the store,则疑问词应为Where，表示地点，此句应为 Where did Tom buy a new computer yesterday?
若划线部分为yesterday,则疑问词为When，表示时间，此句应为 When did Tom buy a new computer from the store?
希望对你有帮助~~~ ^^
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否定句通常在BE动词，情态动词后加Not。例如I can play basketball就变为I can not play basketball.
一般疑问句就是把BE动词提前，其他不变。例如He is a student.就变为Is he a student?
对划线部分提问，先找疑问词替代划线部分，之后将BE动词提前。例如He is doing homework,向 doing homework划线，则变为What is he doing.可见疑问词what代替了划线部分。
一般疑问句就是把BE动词提前，其他不变。例如He is a student.就变为Is he a student?
对划线部分提问，先找疑问词替代划线部分，之后将BE动词提前。例如He is doing homework,向 doing homework划线，则变为What is he doing.可见疑问词what代替了划线部分。
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