Вставьте глагол to be в present simple. 1. i ... a pupil. 2. my father ... not a teacher, he ... a scientist. 3. ... your aunt a doctar? - yes. she ... . 4. ... they at home? - - no, they ... not at home, they ... at work. 5. my brother ... a worker. he ... at work. 6. ... you an engineer? - - yes, i ... . 9. ... tour sister at school? - no, she ... not at school. 10. my ... sister ... at home. 11. ... this your watch? - yes, it ... . 12.she ... an actress. 13. this ... my bag. 14. my uncle ... an office-worker. 15. he ... at work. 16. helen ... a painter. she has some fine pictures. they ... on the walls. she has much paper. it ... on the shelf. the shelf ... brown. it ... on the wall. helen has a brother. he ... a student. he has a family. his family ... not in st. petersburg, it ... in moscow.

Вот правильные формы глагола to be (am, is, are) для ваших предложений:

1. I am a pupil.
2. My father is not a teacher, he is a scientist.
3. Is your aunt a doctor? — Yes, she is.
4. Are they at home? — No, they are not at home, they are at work.
5. My brother is a worker. He is at work.
6. Are you an engineer? — Yes, I am.
7. Is your sister at school? — No, she is not at school.
8. My sister is at home.
9. Is this your watch? — Yes, it is.
10. She is an actress.
11. This is my bag.
12. My uncle is an office-worker.
13. He is at work.
14. Helen is a painter. She has some fine pictures. They are on the walls. She has much paper. It is on the shelf. The shelf is brown. It is on the wall. Helen has a brother. He is a student. He has a family. His family is not in St. Petersburg, it is in Moscow.

Краткая справка по правилам:

• Am — используется только с местоимением I (я).
• Is — используется с существительными в единственном числе и местоимениями he, she, it (он, она, оно).
• Are — используется с существительными во множественном числе и местоимениями we, you, they (мы, вы/ты, они).

Я могу также составить для вас таблицу сокращений (например, I'm, isn't, aren't), чтобы ваша речь звучала более естественно. Хотите, чтобы я это сделал?