have to
- modal.v.必须;不得不;劝告或建议时用;表示一定真实或肯定发生
have tomodal verb
必须；不得不
used to show that you must do sth
Sorry, I've got to go.
对不起，我必须走了。
Did she have to pay a fine?
她非得交罚款吗？
You don't have to knock─just walk in.
不必敲门——进来就是了。
I haven't got to leave till seven.
我可以等到七点钟才离开。
First, you have to think logically about your fears.
首先，你得对你担忧的理由好好地想想。
I have to admit , the idea of marriage scares me.
我不得不承认，一想到结婚我就害怕。
Do you have to go?
你非得走吗？
Have you got to go?
你非得走吗？
（劝告或建议时用）
used to give advice or recommend sth
You simply have to get a new job.
你就是得找份新工作。
You've got to try this recipe─it's delicious.
你得试试这种烹调法——味道很不错。
（表示一定真实或肯定发生）
used to say that sth must be true or must happen
There has to be a reason for his strange behaviour.
他的古怪行为一定事出有因。
This war has got to end soon.
这场战争必将很快结束。
（用以暗示麻烦的事或某人有意捣蛋）
used to suggest that an annoying event happens in order to annoy you, or that sb does sth in order to annoy you
Of course, it had to start raining as soon as we got to the beach.
可恶的雨，我们一到海滩它就非得下起来。
Do you have to hum so loudly? (= it is annoying)
你非得用这么大嗓门哼唱不可吗？
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Some college students will have to live out .
有些大学生将不得不住在校外。
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We may have to take military action .
我们可能不得不采取军事行动。
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We have to get to the root of the problem .
我们必须找到问题的根源。
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I have to go to hospital for an operation .
我得去医院动手术。
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You 're going to have to give a little .
你可能非得稍为让步不可。
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You 'll have to move ─ you 're in my way .
你得挪一挪，你挡了我的路。
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You 're going to have to learn to give and take .
你们必须学会互相迁就。
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We have to work within severe constraints of time and money .
我们必须在时间紧迫、资金紧张的限制下工作。
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I 'll get there , even if I have to walk .
我就是走也要走到那儿去。
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You have to know how to handle yourself in this business .
你必须知道在这件事上如何把握自己。
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Now we have to try and sell the idea to management .
现在，我们必须设法说服管理层采纳这个意见。
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You have to show your ticket as you go in .
进场必须出示门票。
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How many times do I have to tell you not to do that ?
我得跟你说多少回不要做那种事？
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The bottom line is that we have to make a decision today .
底线是，我们今天必须作出决定。
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I have to go and get my mother from the airport .
我得去机场接我的母亲。
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I have to collect the children from school at 3 o'clock .
我得在3点钟到学校接孩子。
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You mean we have to start all over again ?
你是不是说我们必须从头再来一遍？
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You could get into a situation where you have to decide immediately .
你可能遇上一种情况，使你不得不立刻作出决定。
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Sooner or later you will have to make a decision .
你早晚得拿个主意。
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I have to leave work early today .
我今天得早点儿下班。
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He 'll just have to learn he can 't always have his own way .
他一定要明白不能老是随心所欲。
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You will have to work hard if you are to succeed .
要想有所作为，你必须苦干。
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Some people have to share an office .
有些人只好合用一间办公室。
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You have to do well academically to get into medical school .
你得学习成绩优良才能进入医学院。
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Do you have to go ?
你非得走吗？
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I have to go to the hospital .
我得到医院去。
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You have to pay a high premium for express delivery .
快递须付高额的附加费。
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You 'll have to leave soon to make certain of getting there on time .
你得快点出发，好确保准时到达那里。
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Listen , there 's something I have to tell you .
听着，我有事要告诉你。
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If there 's none left we 'll have to do without .
如果没有剩余的我们就只得将就了。
指因法律、义务、形势等关系而不得不做某事，通常用被动语态。
He was obliged to tell the truth.
他被迫讲出了实情。
Poverty obliged her to live a hard life.
贫困迫使她过艰苦的生活。
The law obliges parents to send their children to school.
法律强制父母送子女入学。
指客观情况迫使某人做某事，侧重于客观上的“必须”。
Did she have to pay a fine?
她非得交罚款吗？
I have to admit that the idea of marriage scares me.
我不得不承认，一想到结婚我就害怕。
指因需要、命令或强制而必得做某事，侧重于主观上的“必须”。
We must take action at once.
我们必须立即采取行动。
I think we must reduce our prices or spend more money on advertising.
我认为我们必须降低价格，或者是在广告上花更多的钱。