of course we use mandarin everyday.you know that abot 1.3billion people speak chinese all over the world.now,it's more pop than before.but we have so much accents here that sometimes we cannot understand the people from other places.i think it's hard for foreigners to learn chinese,because it's different between what we say and what we write,but i'm sure you can handle it. however,english is spoken the most widely in the world,also in china.but it's still wierd if you speak english to your friends or family.