how to predict behaviors in others

I'd say I am good at this already. HaHa!!! (Kidding a bit)
Though prediction of the behavior of others can make life quite boring. In particular when those others are easy to read/easy to predict. People are indeed easy to predict once you got to know them for a while. It gets harder to surprise one another once you live together, for example. So sometimes I just do something out of order for my husband, for example. Or I answer in an unusual way but I must say it's not easy for myself to change my communication style - practice needed:)

Thanks for the lectures! Good, reading made me a bit tired. Though I really like English.