Could you do me a favor and pass me the book on your left hand?
能否请你帮我一个忙把你左手边的书递给我？
Could you do me a favor and take these bags to my room?
能否请你帮我帮这些袋子提到我房间？
Could you do me a favor and shut off the door?
劳驾，请把门关上好吗？