if you have some event, and you want someone to listen, you can talk about the event. its simple. one of the most important is collaboration of continuing the conversation for each other.you should make a rule giving many question like "what did you think...", "what did you feel...", "how long...", "have you ever..." to each other to expand the talking. or, if you are beginner of learning language, it will be a topic if you can share the conversation. to follow each other in other's language. A:"today i watched a movie, but i was in dream because it was a flat."(in B's language) B:"you watched a movie, and you slept on a flat bed?"(in A's language) A:"No, i slept on the seat the theater. i mean the movie was not fun."(in B's language) it may be funny talking. and it is also important that never overworks. if your talking is stop, you should say "ok thats all, how about you?" of course it is not bad to continue talking if you have more to talk to, but you should make a rule that it is a signal of finish.