Упражнение 1. Вставьте нужную форму вспомогательного глагола BE (am, is, are) в предложения.

My friend __________reading a book.
I _________drinking tea.
They _______ making noise.
He ________looking through the window.
She ________helping about the house.
We __________ watching TV.
Granny _________cooking dinner.
The birds __________swimming on the lake.
The dog ________sitting at the door.
It _________looking at me.