Re: "I got it" (1) doesn't make sense.
(2) makes sense but has a completely different meaning to the sentences you were asking about. It's the same as You have to do what?? Remember that have to expresses necessity - eg My train's at 6 so I have to get up at 4.30 and have got to can function as an alternative version : My train's at 6 so I've got to get up at 4.30. There's no difference in meaning between these two. |