I have been teaching English for 3 years at a state university in Turkey. I have mainly taught English reading, writing and speaking skills up until now. This year the English Language and Literature department asks me to teach "Modern English". I asked them what they meant by "Modern English", and they told me that students were tired of studying with old English texts and it would be "fun" for them to study modern English. I believe they want me to focus on colloquial English. Do you know any ESL books focusing on colloquial English? Or should I just prepare my own material using authentic sources? Students are upper-intermediate, and they will have "Modern English" for 4 hours a week. Thank you!