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.