YOU SAID:

If you don't, then who will

INTO JAPANESE

そうしないと、誰が

BACK INTO ENGLISH

If you don't, who will?

INTO JAPANESE

そうしないと、誰がやるの？

BACK INTO ENGLISH

If you don't, who's gonna do it?

INTO JAPANESE

そうしないと誰がやるんだ？

BACK INTO ENGLISH

If you don't, who's gonna do it?