I am teaching a monolingual class. Most students come for socializing, very few are serious students. Most classes have up to 12 or more students. I find it v. hard to do speaking activities with them, as they just question and answer their partners in their L1, and even when i go around the class monitoring, and telling them to speak in English, they just resort back to L1, since they don't have much motivation to speak English. They only come in the first place to get out of the house and meet up with friends.
How do I solve this problem? Even when I tell them to speak in English with their friends, not just in PW and GW, but all the time, they of course don't. And most of the time I get so tired that I just stop telling them. They are adults, and paying students, so I can't v. well kick them out of class or anything like that.