[Ruggich]

I would totally suggest basing your lesson around introductions. Try to think about the lesson as an assessment. Introductions are something that can also be varied depending on the student's level. A low level speaker can be taught "to be," as in, "I am New Student nice to meet you." If the student is high beginner or intermediate you can teach the additional types of answers for the question "How are you?" It seems to me many students get drilled the response, "Fine, thank you and you?" Teach them the more common colloquial responses. "Alright, okay, good" The higher the level is the more variations you can use. I've used introductions to teach the use of the word "pretty."
Teaching the students pretty good and pretty lousy then eliciting what they thought, "pretty" meant, then explaining the difference between very and pretty. There are all kinds of options in a lesson on introductions.