Grammar FocusGrammar Focus情态动词could If we need help, what should we say politely?Which is the most polite one?1. Sweep the floor, Peter!2. Can you sweep the floor, Peter?3. Could you please sweep the floor，Peter? Could you please clean your room? Yes, sure. Could you please do the dishes? Sorry, I cant. I have to do my homework. Could I go to the movies? Yes, you can. Could I use the car? No, you cant. I have to go out.1. could表示请求，语气委婉，显得有礼貌 Could you please clean your room? 你可以打扫你的房间吗？ 肯定回答：Ye
