Exercise 1.
1. Sasha goes to the hospital to call the doctor.
2. Our class goes to visit the museum.
3. We leave home at seven not to be late for the bus.
Exercise 2.
1. We will have a meeting tomorrow.
2. The nurse will come at 2 o'clock tomorrow.
3. Ann will sing an English song tomorrow.
Exercise 3.
1. Pete went to the bus-stop to meet his mother yesterday.
2. The pupils read the text again to understand it.
3. Zina invited Ann to have tea with her family yesterday.
Exercise 4.
1. They are speaking, they're not shouting.
2. Mary is running, she's not walking.
3. I am eating, I'm not drinking.
4. The teacher is speaking, she's not reading.
Exercise 5.
1. Jerry was studying.
2. The girls were rehearsing.
3. The students were reading.
4. Susan was having breakfast.