Summary: In China you may not want other people to know when your birthday is. Its customary for the person having the birthday to take all of their friends out for dinner and pay for everything. So the more popular that you are the more you have to spend. Its always better to ask someone else when their birthday is so that you get an invite to dinner where they have to pay rather than you paying. For dialogue texts, translation, grammar explanation and learning tools, please visit AtoZChinese.com.
