Ex.2. fill in the blanks with the required forms of the verb to be in the present tense: 1. i twenty. 2. you thirty. 3. they doctors. 4. she a swimmer. 5. he a very good friend. 6. we very busy in summer. 7. one of my friends fond of reading. 8. football the most popular kind of sport. 9. my father … proud of my marks. 10. my friends … good at different sport games.