i guess it works like this: when u get on the bus and pay for the fare, ask the driver to give you a transfer. It should have the time and the bus number printed on it. THen u can show it to the metro staff
Change from Bus to Metro or Metro to Bus, there has a time limit (I think it is 90minutes). For the Bus one, they printed the date, time, direction and so on.5 |+ l3 H$ P: F9 i2 E1 {1 b$ k7 o
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After you took the metro, you want to take the bus again. Don't forget to pick up the transfer ticket from the machine in the station where you get on the metro. If you use the ticket which you pick up from the destination station, it may cause problem.