1， 在表示一次性动作时，have to和 have got to 是能够互换的：
I have (got) to be back by ten o’clock.
本人必需10点前返回来。
I haven’t got to work tomorrow.
本人明天不用上班。
I’ve got to do something! Langdon thought.
兰登想：“本人得做点什么！”
2， 但是，当表示习气性动作时，特别是当句中含有表示经常性的副词（如always, often, sometimes等）时，则应运用have to , 而不运用have got to:
I don’t usually have to work on Sundays.
通常本人再星期天不用工作。
I often have to get up at 5.
本人常常必需五点起床。
3, have to 与 have got to 的另一区别，就是后者不大用于
过去时。
They didn’t have to worry about money.
他们那时不用为金钱而操心。
I had to walk very fast to overtake you.
为了赶上你，本人不得不走得很快。
4， 最后一个区别，就是have to 前可加助动词或神态动词，或者用在停止体和完成体构造中，而have got to却不能：
I shall have to help him as much as I can.
本人将不得不尽本人所能去协助他。
He may have to cancel his plan.
他或许不得不取消这个方案。
People are having to boil their drinking water during this emergency.
在这个紧急状况下，老百姓必需煮沸他们的饮用水。
The administration has had to make unpopular decisions.
行政部门不得不做出不得人心的决议。
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