have to的否定和疑问句 have to是情态动词 应该不能加助动词变吧?

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haveto的否定和疑问句haveto是情态动词应该不能加助动词变吧?haveto的否定和疑问句haveto是情态动词应该不能加助动词变吧?haveto的否定和疑问句haveto是情态动词应该不能加助

have to的否定和疑问句 have to是情态动词 应该不能加助动词变吧?
have to的否定和疑问句 have to是情态动词 应该不能加助动词变吧?

have to的否定和疑问句 have to是情态动词 应该不能加助动词变吧?
否定:don't have to
疑问句:Do.have to...

have to通常指由于客观原因则不得不做某事,意思为“不得不”。
e.g. It's dark now. I have to go home.
天黑了,我不得不回家。
It's raining, and I have to stay at home.
外面在下雨,我不得不呆在家里。
一、have to与一般情态动词的异同
相同点:

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have to通常指由于客观原因则不得不做某事,意思为“不得不”。
e.g. It's dark now. I have to go home.
天黑了,我不得不回家。
It's raining, and I have to stay at home.
外面在下雨,我不得不呆在家里。
一、have to与一般情态动词的异同
相同点:
一般的情态动词不能单独作谓语,后面必须接动词原形一起构成谓语,have to 也是这样。
不同点:
1、一般的情态动词没有人称和数的变化,而且所用的时态也受到一定的限制,而have to 有人称和数的变化。可用于多种时态中:一般现在时中当主语是第三人称单数时要用has to,其余的人称用have to,一般过去时中要用had to; 一般将来时中则要用will have to.
e.g. She has to go to school by bus.
她不得不乘公汽上学。
You'll have to see the doctor if you get ill.
如果你生病了,就得去看医生。
2、否定句和疑问句的构成方式不同:
①一般的情态动词直接在后面加not构成否定句,把这些情态动词提到句首就构成一般疑问句。
②而have to 的否定句和疑问句的构成往往要借助于助动词do的适当形式或助动词will即have to, has to, had to和will have to的否定式分别为don't have to, doesn't have to, didn't have to和won't have to,疑问句是在句首加助动词do的相应形式,句中还原成have to或把will放到句首,这里have to简直就是一个十足的行为动词。
e.g. What does she have to do?
她必须做什么?
You didn't have to wait for me yesterday.
昨天你没有必要等我
回答者:kathyrine - 助理 三级 6-5 22:05
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其他回答共 4 条
i have to finish my homework today.
是情态动词,“不得不”的意思。
跟其他情态动词一样,用在主语和谓语之间。
回答者:sun_snow - 魔法师 四级 6-5 22:02
比较have to和must
1) 两词都是'必须'的意思,have to 表示客观的需要, must 表示说话人主观上的看法,既主观上的必要。
My brother was very ill, so I had to call the doctor in the middle of the night. 我弟弟病得很厉害,我只得半夜里把医生请来。(客观上需要做这件事)
He said that they must work hard. 他说他们必须努力工作。(主观上要做这件事)
2) have to有人称、数、时态的变化,而must只有一种形式。但must 可用于间接引语中表示过去的必要或义务。
He had to look after his sister yesterday.
3) 在否定结构中: don't have to 表示"不必"
mustn't 表示"禁止",
You don't have to tell him about it. 你不一定要把此事告诉他。
You mustn't tell him about it. 你一定不要把这件事告诉他。
回答者:引力流 - 副总裁 十级 6-5 22:02
have to
不得不,必须
"'You'll have to get off here,' the conductor said."
"`你得在这里下车了,'售票员说。"
I have to go now.
我现在该走了。
(= have got to)
Children do not have to cross busy streets to go to school.
孩子们上学不用穿越繁忙的街道。
回答者:jincai688 - 经理 五级 6-5 22:04
①have to通常指由于客观原因则不得不做某事,意思为“不得不”。
e.g. It's dark now. I have to go home.
天黑了,我不得不回家。
It's raining, and I have to stay at home.
外面在下雨,我不得不呆在家里。
一、have to与一般情态动词的异同
相同点:
一般的情态动词不能单独作谓语,后面必须接动词原形一起构成谓语,have to 也是这样。
不同点:
1、一般的情态动词没有人称和数的变化,而且所用的时态也受到一定的限制,而have to 有人称和数的变化。可用于多种时态中:一般现在时中当主语是第三人称单数时要用has to,其余的人称用have to,一般过去时中要用had to; 一般将来时中则要用will have to.
e.g. She has to go to school by bus.
她不得不乘公汽上学。
You'll have to see the doctor if you get ill.
如果你生病了,就得去看医生。
2、否定句和疑问句的构成方式不同:
①一般的情态动词直接在后面加not构成否定句,把这些情态动词提到句首就构成一般疑问句。
②而have to 的否定句和疑问句的构成往往要借助于助动词do的适当形式或助动词will即have to, has to, had to和will have to的否定式分别为don't have to, doesn't have to, didn't have to和won't have to,疑问句是在句首加助动词do的相应形式,句中还原成have to或把will放到句首,这里have to简直就是一个十足的行为动词。
e.g. What does she have to do?
她必须做什么?
You didn't have to wait for me yesterday.
昨天你没有必要等我
回答者:蔡浞 - 秀才 二级 6-5 22:39

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haven't to
Do I have to....

have to的否定形式和疑问句形式分别是? 含have got to 的句子的否定和疑问句的构成借助啥?含have to 的句子的否定和疑问句的构成借助啥 have to的否定和疑问句 have to是情态动词 应该不能加助动词变吧? have to和have got to 的否定形式 写情态动词have to的肯定句,否定句,一般疑问句,肯定回答和否定回答! have和 have got的区别尤其是在疑问句和否定句方面 have引导的一般疑问句怎么做肯定和否定回答 比如说 Have you any honey? 问某人去了哪里的现在完成时的否定句,肯定句和一般疑问句 比如Where have you been I have been to library 这样的 I have already been to Beijing.改为否定句和一般疑问句 I stopped to have a rest改为一般疑问句和否定句 I have just been to the cinema.改为否定句和疑问句 Kiss does her hnmework with us(改成否定和一般疑问句)I have just been to North City Park(改成否定和一般疑问句)I have already been to Water World(改成否定和一般疑问句) 用must,have to造句 两个肯定句 两个否定句 一个一般疑问句 并进行肯定和否定回答 We are going to have a picnic next week.改为否定句,一般疑问句和特殊疑问句 请问must的一般疑问句的否定回答可以是:No,I don't have to 以must 开头的疑问句,否定回答是 needn't,don't have to可以吗? 写出 had better 和 have to 的疑问句 陈述句 I have a book 怎么变疑问句和否定句