You've got to do something 你一定得想个办法

have to和have got to的区别是：就是后者不大用于过去时.

have got to这里不是完成时态. have got to 一般没有“习惯性”的含义，而且，当它和具有动态意义的动词连用时，常常是指将来。

例句:

You ought to do something about that cough.

你应对你的咳嗽想点办法。