A: how do you celebrate national day in your country?
B: there are parades in many cities and people fly the national flags from almost every public building.
A: what kinds of parades are there?
B: the parades are usually military ones, but sometimes there are procession of people carrying flags and singing patriotic songs. What do you do on national day in your country?
A: we don't have a national day.
B: really? That's unusual.
A: I guess it is. Most countries have on, but we don't.
B: actually, even though we have parades, most people just use the national day holiday to visit family or go shopping. In the evening, many people watch special TV shows which celebrate national day.
