2. We would not normally use 'switch off' here.....you can, but it is not normal. She was speaking impolitely so I ignored her and left the room.
3. This is definitely wrong, I'm afraid. I don't like these tough homework assignments. We don't use 'switch off' here.
4. You seem to be elsewhere. Shall we talk about something else ? Again, we don't normally use 'switch off' here.
Switch off the lights, the TV, the car engine etc. One of my students switched off half way through the lesson and looked out of the window. He was boring me silly (he was sending me to sleep) so I switched off and imagined him wearing a bathing suit.
Student or Learner