帮忙看一下这篇文章有没有语法错误，要参加比赛的。非常感谢！在线等。

写文章最好不要用缩写. 还有, 世博都过了你还这样写?
以下是我尽量修改后的, 希望可以帮助你.
The World Exposition in Shanghai began to hold on May, 1st and it ended on October, 13th. There were 184 days for people to go to it.
Many people said that it was so wonderful. I do think so. There were hundreds of pavilions, such as Japanese pavilion, Korean pavilion, and Canada pavilion. Many people were from other countries, and some people talked with them in English. We tried to make a nice impression to our friendly foreign friends. This was a successful banquet of different culture. I saw some volunteers in the exposition. They all wore uniforms, and they friendly helped me. They showed me the way to where we wanted to go. I really wanted to be a volunteer like them!

楼主真的写的很好，没语法错误