YOU SAID:

So i went to the basement with my sister but when we went down the stairs we heard strange sound so we went to our room back

INTO JAPANESE

姉と一緒に地下室に行ったのですが、階段を降りると変な音がして部屋に戻りました

BACK INTO ENGLISH

I went to the basement with my sister, but when I went down the stairs, I heard a strange noise and returned to the room.

INTO JAPANESE

姉と一緒に地下室に行ったのですが、階段を降りると異音がして部屋に戻りました。

BACK INTO ENGLISH

I went to the basement with my sister, but when I went down the stairs, I heard a strange noise and returned to the room.