Some people eat to live. 有些人吃东西为的是要生存. I eat a lot of fruit in order to stay healthy. 我吃很多水果.为的是要保持健康. To improve her English Kate studies every day 为了提高英文水平, 凯特每天都在用功. In order to become a professional photographer,Billy is studying photography. 为了成为职业摄影师, 比利正在学习摄影. We must learn to have a balanced diet. 我们必须懂得吃均衡的饮食. Barry should learn how to eat a balanced diet. 巴里应该懂得如何吃均衡的饮食. I ought to learn how to talk politely to others. 我应该要学习如何和人说话有礼貌. You might want to learn how to knit some day. 有一天你也许会想学如何编织.