Exercise 1: Fill in the blanks with the correct form of the verb 'to be'.

1. My friend is reading a book. 2. I am drinking tea. 3. They are making noise. 4. He is looking through the window. 5. She is helping about the house. 6. We are watching TV. 7. Granny is cooking dinner. 8. The birds are swimming in the lake. 9. The dog is sitting at the door. 10. It is looking at me.