YOU SAID:

I like fish but only when they can't kill me

INTO JAPANESE

私が好きな魚だのみとき彼らは私を殺すことはできません。

BACK INTO ENGLISH

I like the fish only if they cannot kill me.

INTO JAPANESE

彼らは私を殺すことはできない場合にのみ、魚が好き。

BACK INTO ENGLISH

If they cannot kill me only, like fish.

INTO JAPANESE

彼らは魚のようなだけ、私を殺すことはできない場合。

BACK INTO ENGLISH

If they cannot kill me just like fish.

INTO JAPANESE

彼らは殺すことができない場合私はちょうど魚が好き。

BACK INTO ENGLISH

If they cannot kill me just like fish.