One possible version：

Computers are becoming more and more important in our daily life. Do you know the history and the changes of computers? Computer was invented in 1946. At that time, The machine was huge and it was as large as a big house. It weighed about 30 tons.

Computer is a very useful tool in our life, in our study as well as works. For example, computer can send some messages to foreign friends by E-mail. The computer can open our eyes to let us know more. Computer is the most helpful invention in the world. Computer can help us in study or work. There are many computer functions（功能）We can listen to music or play the game on computer. It makes us relax.

It’s hard to imagine what our life would be like if we had no computers in our daily life. And in my opinion, computers are going to change our life completely in the near future.

本题是写一篇给定材料的书面表达，主要是写计算机的有关情况，内容包括计算机在我们生活中的作用，计算机的发明时间，地点，大小和用途，计算机的改变，以及个人对计算机的看法和未来的想象，在写作时应注意使用多种不同时态，同时注意语言的准确性和连贯性。