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Can you keep an eye on my bag? 帮我看一下包好吗? Keep an eye on sth 照看（照顾）某物 For example: A: I would like to go to toilet.Can you keep an eye on my bag? B: Of course I can. What kind is the most durable? 哪一种最耐用？ when we go to shop ,we intend to buy something which can be used for long time. May I introduce you to Dr. Johnson? 让我把你介绍给Dr.Johnson! introduce sb. to sb.介绍某人（某事）给某人。 You can use this sentence:May I introduce you to sb,when you wanna introduce your friends to another people that you know. Dont waste my time anymore. 别再浪费我的时间了! waste n. 废物,浪费,损耗,消耗,荒地,垃圾,地面风化物 When you are tired of talking with one, you could end your conversation in saying this. When someone tries to persuade you, you could use this sentence to present your steady opinion. We can put it off till Tuesday at 9:30. 我们可以推迟到星期二9点30分。 prefer...to... 宁可，宁愿（选择）; 更喜欢 在小D的（080819）这一期中也用到了prefer这个句型 | 
