One of the biggest airports but now another bigger...

One of the biggest airports but now another bigger than this is being constructed in Beijing, hopefully will be operational till October 2020.
There are three terminals of this airport, 1 and 2 are at one place, terminal 3 is a little bit far, so you have to take subway (which is inside airport). People are friendly but if you find language gap use google translator (download offline pack in advance, because google doesn't work in China).