Yesterday

Yseterday was a very tired day.Because I gave up sleeping after lunch instead of studying in classroom with my classmate.What a hardworking boy,haha!
By the way, I was surprised at a thing that my friend from Thailand was using QQ which was a famous communication tool in China. I always thought only Chinese used it and other foreigners used facebook ,Skype and so on. So the reality proved that I was wrong completely and I underestimated the influence of QQ.
Do u guys have a QQ number?

Yesterday

Yesterday was a very tiring day, because I gave up sleeping after lunch and instead studied in the classroom with my classmate. What a hardworking boy, haha!

By the way, I was surprised that my friend from Thailand was using QQ, which is a famous communication tool in China. I always thought that only the Chinese used it and other foreigners used Facebook, Skype, and so on. Reality proved that I was completely wrong and underestimated the influence of QQ.

Do you guys have a QQ number?

Your English is quite good! In some of your sentences your grammer is a bit mixed up, so its hard to tell what it is you want to say. Another small thing is your spaces between words. Spaces come after every period (except in acronyms eg. U.S.A) and after every comma. They don't come immediatly before. But other than that you're golden!

I haven't heard of QQ before, but I will go look at it!