YOU SAID:

i want to kill my sister

INTO JAPANESE

私の妹を殺したいです。

BACK INTO ENGLISH

You want to kill my sister.

INTO JAPANESE

私の妹を殺すためにします。

BACK INTO ENGLISH

To kill my sister.

INTO JAPANESE

私の妹を殺す。

BACK INTO ENGLISH

Kill my sister.

INTO JAPANESE

-　姉妹が

BACK INTO ENGLISH

My sister.

INTO JAPANESE

-　姉妹が

BACK INTO ENGLISH

My sister.