outline

Thesis statement:
There are many bad effects of the overuse of PC, and here are the three most important ones: (1) health, both of physical and mental, (2) the skill of language goes backward

1st Topic sentence:
The most significant result of the overuse of personal computer is the increasing of diseases, such as decreased vision, obesity, mouse hand and some cancers because of radiation.
Supporting details:
This hurts our sights a lot when facing computers too long. As the data show, the number of sight problems caused by computer is 10 times more than other reasons.
The eating habits change when we spend a lot of time with computers.
When being used to push bottoms, we may become mouse hands.
Computers also release radiation, which causes bad diseases.

2nd Topic sentence:
Except for the physical diseases, the longtime of using computers will also results in some sever mental problems like sleeplessness and nervous tensions.
Supporting details:
Most of the computer-addicted people have a day and night reversed schedule, which influences their sleeping quality.
As we live in a high speed-moving environment, the stress of competition makes people nervous, which is more apparent in Internet world with the highest velocity of development.

3rd Topic sentence:
With the help of the developed technology, our basic skills of using languages decrease.
Supporting details:
My mom once said because she always composed with the software word, which helps her find the spelling mistakes or writes the right words for her. This leads to her disability of using her native language.
Also, when we talk with someone by computer, we do not speak out, which affects our speaking abilities.

Conclusion
The bad effects of using PC too much reflect in both physical and mental health and the backward of language skills, which shows that people are back-socialized.