YOU SAID:

I guess we said enough to know it's all in vain

INTO JAPANESE

私たちはそれがすべて無駄だと知っているのに十分言ったと思います

BACK INTO ENGLISH

I think we said enough to know it was all useless

INTO JAPANESE

私たちはそれがすべて役に立たないことを知るのに十分だと思います

BACK INTO ENGLISH

We think it's enough to know that it's all useless

INTO JAPANESE

役に立たないことを知るだけで十分だと思います

BACK INTO ENGLISH

I think it's enough to know that it doesn't work

INTO JAPANESE

動作しないことを知るだけで十分だと思います

BACK INTO ENGLISH

I think it's enough to know that it doesn't work