In my classes I speak the language I teach, for grammar I prepare examples in very useful books... I will find very striking sentences and expressions in magazines, newspapers and especially in literary works such as in novels or in collections of poetry. For each lesson, I ask my students to explain myself and to find examples themselves in books or newspapers. If the lesson is a grammar lesson, I ask my student to correct me when I make a few mistakes on purpose. If this is a conversation class, at each class, I give a topic to discuss for the next session...