- Go upstairs. (to go)
- Don`t swim in this lake. (not/to swim)
- Do your homework. (to do)
- Don`t football in the yard. (not/to play)
- Brush your teeth. (to brush)
- Don`t talk during the lesson. (not/to talk)
- Don`t feed the animals in the zoo. (not/to feed)
- Read the instructions. (to read)
- Don`t be late for school. (not/to be)
- Switch off your mobiles. (to switch off)