Writing prompt: My Free Time

Student essay:
My hobby is playing basketball,swimming and so on.But in my free time,I often play computer games with my brother,we often play SanGuo games.I often watch TV and fly a kite.I usually go to the library to buy some books,I thinks it is good for my studys.My friends usually invite me to his party.I have a good time in the partty.I'm very happy,I like my free time.

Corrected essay:
My hobby is playing basketball, swimming and so on. But in my free time, I often play computer games with my brother. We often play SanGuo games. I often watch TV and fly a kite. I usually go to the library to buy some books. I think it is good for my studies. My friends usually invite me to their party. I have a good time in the party. I'm very happy. I like my free time.