Like many teachers, I usually begin a course by introducing useful classroom English, such as: Could you say that again? Please speak more slowly and I don't understand with the expectation that students will use these expressions during class. I often prepare name cards for my students and on the back of these folded cards I have students write these phrases so that they are in easy view throughout the lesson. Even with these prompts handy, it is sometimes hard to get students to use the phrases readily and for them to really understand how useful these phrases can be. By doing this activity, students actively use these expressions in a fun and meaningful way and become aware of how effective these phrases are in a real context.