(Lin Ying wants to buy a computer. But his mother doesn't agree because she is afraid that Lin Ying play games with computer which will affect his study. Lin Ying is persuading his mom to buy one for him.)

Lin: Mom, a lot of my classmates have computers now. I think I should have one.

Mom: I don't think you should have a computer now. How can a computer help you in your study? Since you have teachers, you can discuss the problems with them. But when you have a computer, you will play games and chat in the net. It will affect your study.

Lin: But mom, I won't play with it. Neither will I chat in the net. I'll use it to help me study. You know, computers open up a new world of learning . they are becoming more and more common in universities to practice what I have learned. Furthermore, I can use the computer to contact you.

Mom: But how can you contact me with a computer?

L: You know we can use the internet to communicate with each other. E-mail is very helpful and cheaper than a long distance phone-call. In addition, the e-mail message can be delivered instantly. You don't need to wait days to get my letters.

Mom: Well, Lin Ying. I agree to buy a computer for you. But you should make good use of your time to study. Don't play games with it.

Lin: Thank you , Mom, I promise you I wouldn't waste my time. I'll study hard.