YOU SAID:

what comes in comes out

INTO JAPANESE

出てくるものは、

BACK INTO ENGLISH

What comes out is

INTO JAPANESE

出てくるものは、します。

BACK INTO ENGLISH

I will do what will come out.

INTO JAPANESE

私は出てくることをやる。

BACK INTO ENGLISH

I will do something to come out.

INTO JAPANESE

私は何かを出すだろう。

BACK INTO ENGLISH

I will put out something.

INTO JAPANESE

私は何かを出します。

BACK INTO ENGLISH

I will put out something.