YOU SAID:

You can't do that here, it's illegal.

INTO JAPANESE

ここではできません、違法です。

BACK INTO ENGLISH

It's illegal that you can't do it here.

INTO JAPANESE

ここでできないのは違法です。

BACK INTO ENGLISH

What you can't do here is illegal.

INTO JAPANESE

ここでできないことは違法です。

BACK INTO ENGLISH

What you can't do here is illegal.