Pick at least 5 sentences above that are totally unsuitable for your classes. Why are they unsuitable? What kinds of classes and situations might they be suitable for? What could you say instead in your classes?
How could you make each of those phrases easier to understand, e.g. what gestures could you use and what language could you add to your syllabus?
Once your students get used to that phrase, how can you make it more complicated in order to boost their level but still making sure they understand?