2) She are brushing / is brushing his teeth. 3) My parents are going / is going to ciner 4) Timmy are sitting / is sitting on the dentist's chair. Children are running / is running. (5) The policemen are waiting / is waiting behind the red car. The twins are playing / is playing football. 8) The waiter are serving / is serving the dinner.

Логика такая: выбираем правильную форму глагола в Present Continuous (is/are + verb-ing) в зависимости от подлежащего.

1. She is brushing his teeth.
2. My parents are going to cinema.
3. Timmy is sitting on the dentist's chair.
4. Children are running.
5. The policemen are waiting behind the red car.
6. The twins are playing football.
7. The waiter is serving the dinner.