I figure do not should limit it, the ITALKI is a place that talk and learn language freely, and no any political infulence,i think everyone be here have their own simple reason: exchange language,study language, i figure that's why italki set up. just my point.

sure, at least, i do. hehe.

“正”表示的是此时此刻，突出“现在”这个时候，就像英语语法里的“现在进行时”，并且，放在这里，还有一种增强语势的作用，表达增长速度很快。 没有“正”也可以，但是不能表达出上面说的意思。 另外，你的汉语确实不错，如果你愿意，可以教我英语吗？

hi,friend, thank you, thank you very much for the praise. and welcome to china. did you remember that the drums at the beginning of the ceremony? must amazing, right? i tell you a story about it. it is a kinda culture of ancient china. it is not drum, it is called "fou" in chinese, in ancient china, by chinese people usually welcome friend from far away by strking "fou", i figure you must be hear of the “Analects of Confucius”of china, it is written by Confucius in china, one of the word in the book :you peng zi yuan fang lai, bu yi le hu,means How happy we are, To meet friends from afar!! the word you can seen it on the fringe of Bird Nest at the beginning of the Ceremony, IT just express the hospitable courtesy of china. and, becasue it is the internatial games, will there are a plenty of friend from all of the world come to china, so , the ceremony express hospitable welcome by Striking "fou".

should wirte: 生日快乐！ the alphabet is :sheng ri kuai le! 生日“sheng ri ”means birthday. 快乐”kuai le“ means happy.