15. She ........ an actress. 16. They ........ dentists. 17. I ........ at school. 18. Olga ........ at school. 19. Olga and I ........ at school. 20. Oleg and Ira ........ ready. 21. Larisa ........ late. 22. My name ........ Alla. 23. I ........ eleven. 24. You ........ ten.

Выбираем формы глагола to be: am — с I, is — с подлежащим в единственном числе, are — с they/you и подлежащим во множественном числе.

15. She is an actress.
16. They are dentists.
17. I am at school.
18. Olga is at school.
19. Olga and I are at school.
20. Oleg and Ira are ready.
21. Larisa is late.
22. My name is Alla.
23. I am eleven.
24. You are ten.