YOU SAID:

Whatever goes up must come down

INTO JAPANESE

上がるものは何でも降りなければならない

BACK INTO ENGLISH

Anything that comes up must come down.

INTO JAPANESE

何が起こるものは何でも降りなければならない。

BACK INTO ENGLISH

Whatever happens has to come down.

INTO JAPANESE

必ず来る

BACK INTO ENGLISH

He has to come.

INTO JAPANESE

必ず来る

BACK INTO ENGLISH

He has to come.