YOU SAID:

I should not have died.

INTO JAPANESE

私はない死亡している必要があります。

BACK INTO ENGLISH

I should have died.

INTO JAPANESE

私が死亡している必要があります。

BACK INTO ENGLISH

You should have killed me.

INTO JAPANESE

私を殺したはず。

BACK INTO ENGLISH

Would have killed me.

INTO JAPANESE

私が死亡したと思います。

BACK INTO ENGLISH

I think I died.

INTO JAPANESE

私は私が死んだと思います。

BACK INTO ENGLISH

I think I died.