Sonia is looking (look) for a place to live with her sister until she finds somewhere. She is staying (she / stay) with her sister until she finds somewhere.

Sonia is looking for a place to live with her sister until she finds somewhere. She is staying with her sister until she finds somewhere. (Соня ищет место, где жить со своей сестрой, пока не найдёт что-нибудь. Она остаётся со своей сестрой, пока не найдёт что-нибудь.)