Later on in the lesson the students will get « free » practice of what you taught (see below) but for now we need to « force them » them use what we just taught in a rather unnatural context. Yes, you can’t do PPP lessons all the time or your students will find things too predictable. ARC, Test – Teach – Test, Task Based Learning are a few other approaches you’ll learn on the TEFL course, not to mention whole lessons intended to improve one of the students’ 4 skills (reading, wrting, speaking and listening) rather than grammar.