The VP 做飯 (zuò fàn/ to cook) can occur independently without a PP, i.e. 她做飯 (tā zuò fàn/ She cooks.) When it takes a PP as the location of the action 做飯 (zuò fàn), the PP has to be pre-verbal, i.e. 她在廚房做飯 (tā zài chú fáng zuò fàn/ She is cooking in the kitchen.)
