YOU SAID:

If I translate this into Japanese and back, my back will no longer itch.

INTO JAPANESE

これを日本語に翻訳して戻すと、私の背中はもはやかゆみがなくなります。

BACK INTO ENGLISH

When translating this back into Japanese, my back no longer itches.

INTO JAPANESE

これを日本語に翻訳すると、私の背中はもはや痒みません。

BACK INTO ENGLISH

When translating this into Japanese, my back is no longer itchy.

INTO JAPANESE

これを日本語に翻訳するとき、私の背中はもはやかゆいです。

BACK INTO ENGLISH

When translating this into Japanese, my back is no longer itchy.