1.Hỏi về mục đích - why..............? tại sao.........? Ex: Why do you want to learn English? - what ...........for? để làm gì..........? Ex : what did you buy it for? - what is the purpose of......? Mục đích của.......là gì? Ex: what is the purpose of her visit? 2. Diễn tả mục đích a. For + Noun ( phrase) : để Ex: He has gone out for dinner I went to the supermarket for some foods b. To do.....: để Ex: He has gone out to eat dinner Lưu ý : She has been to the post office for buying stamp --------->>>>