The first thing you need to do is to know how to say "Hello, I don't speak English, can you understand me in Chinese?". If they can understand, since in the cafeteria, then start from the food, foreigners are very polite, and most of them like to stimulate a little bit, direct a few simple words to start intervening in the main topic, so they will feel that you are very good to talk to, very cheerful, and willing to make friends with you, as long as you become a friend, to learn English will be good to do it, and do not have to pay the fee! Three birds with one stone! You can call a foreigner your friend, learn English, and not spend a dime.