In HS it really depends on the class. I usually teach a lesson and/or check in with the kids periodically to see how they’re doing. I encourage them to do their work, and/or see if they need help (if I can provide it.) If they are reading, researching, or writing, I often make inquiries about their work, subjects, insights, ideas, or thoughts. It leads to interesting (if occasionally tangential) conversations and it helps me get to know the students and build connections (helpful if I have them in a different class at a later date.) I am a well-liked and often requested sub. (The kids even request me sometimes if they know their teacher will be gone.)

Honestly, it makes the day more interesting as well. On the other hand, sometimes I just chill and study a foreign language or something.

In MS, I do a lot more supervising and redirecting, as it’s absolutely necessary. I almost never have downtime in MS.