Seven. Using the modal verb could emphasises that the movement of skiers may well trigger the snow to loosen, as opposed to implying that it usually does. the house had no electric powered light or indoor plumbing → la casa no tenía luz eléctrica ni instalación de agua en el inside https://indoor-mats89011.blogtov.com/18417084/the-smart-trick-of-indoor-matting-that-nobody-is-discussing