глагол to be в present simple

Ответ от ZanoZZa[гуру]
Глагол to be в Present Simple имеет три формы: am, is, are. Выбор зависит от подлежащего.
Am используется только с местоимением I.
Is употребляется с he, she, it и существительными в единственном числе.
Are используется с you, we, they и существительными во множественном числе.
В отрицаниях добавляется частица not, а в вопросах глагол выносится на первое место. Примеры правильного заполнения пропусков:
I am a pupil.
My father is not a teacher, he is a scientist.
Is your aunt a doctor? Yes, she is.
Are they at home? No, they are not at home, they are at work.
My brother is a worker. He is at work.
The sky is very blue today. It is not gray.
I am tired. I am not full of energy.
This shelf is heavy. It is not light.
Amy is at home, but her parents are in church.
Are your parents hungry? No, they are not, but they are thirsty.