'have got to do something'?

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Would you explain the difference between these two sentenses?

a) You have to do something.

b) You have got to do something.

=> have got to = have to
차이가 없습니다. 단지 현재 시제에만 쓰이는 것을 조심하면 됩니다.

** have got = have

  Carpe diem, quam minimum credula postero.