1,在表示一次性動作時,have to和 have got to 是能夠互換的：
I have (got) to be back by ten o’clock.
本人必需10點前返回來.
I haven’t got to work tomorrow.
本人明天不用上班.
I’ve got to do something!Langdon thought.
蘭登想：“本人得做點什么!”
2,但是,當(dāng)表示習(xí)氣性動作時,特別是當(dāng)句中含有表示經(jīng)常性的副詞（如always,often,sometimes等）時,則應(yīng)運用have to ,而不運用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.
本人常常必需五點起床.
3,have to 與 have got to 的另一區(qū)別,就是后者不大用于過去時.
They didn’t have to worry about money.
他們那時不用為金錢而操心.
I had to walk very fast to overtake you.
為了趕上你,本人不得不走得很快.
4,最后一個區(qū)別,就是have to 前可加助動詞或神態(tài)動詞,或者用在停止體和完成體構(gòu)造中,而have got to卻不能：
I shall have to help him as much as I can.
本人將不得不盡本人所能去協(xié)助他.
He may have to cancel his plan.
他或許不得不取消這個方案.
People are having to boil their drinking water during this emergency.
在這個緊急狀況下,老百姓必需煮沸他們的飲用水.
The administration has had to make unpopular decisions.
行政部門不得不做出不得人心的決議.