请求别人做某事时有哪些表示，对方如何肯定否定回答(用英语） Could you do me a favour？Could you help me？Would you mind if you can do sth for me？Would you give me a hand？May I ask you a favor 肯定回答：Sure。with plesure否定回答 I'm sorry I'm afraid
英语翻译 effect on.对.有影响must have done 是对过去事情的肯定推测，意为：“肯定已经做了某事.”
一定会做某事用英语怎么说 you must need sth.你一定需要什么东西you must do sth.你一定要做什么事情
