同学你好，该知识点来自沪江网校《英语零基础直达大学六级【全额奖学金班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
在表示一次性动作时，have to和have got to是可以互换的，如：
I have (got) to be back by ten o'clock. 我必须10点前返回来。
I haven't got to work tomorrow. 我明天不必上班。

但是，当表示习惯性动作时，尤其是当句中含有表示经常性的副词 （如always, often, sometimes等）时，则应使用have to, 而不使用have got to，如:
I don't usually have to work on Sundays. 通常我在星期天不必工作。
I often have to get up at 5. 我常常不得不5点钟起床。

have to 与 have got to的另一区别，就是后者不大用于过去时，如：
They didn't have to worry about money. 他们那时不必为金钱而操心。
I had to walk very fast to catch up with you. 为了赶上你，我不得不走得很快。

have to 前可加助动词或情态动词，或者用在进行时和完成时结构中，而have got to却不能，如：
I shall have to help him as much as I can. 我不得不尽我所能去帮助他。
He may have to cancel his plan. 他也许不得不取消他的计划。

祝同学学习进步~