YOU SAID:

You will go back at 12 and stay.

INTO JAPANESE

12時に戻って滞在します。

BACK INTO ENGLISH

I will stay back at 12 o'clock.

INTO JAPANESE

私は12時に戻ってきます。

BACK INTO ENGLISH

I will be back at 12 o'clock.

INTO JAPANESE

私は12時に戻ってきます。

BACK INTO ENGLISH

I will be back at 12 o'clock.