Подскажите я не могу разобраться !

Упражнение 1

1) My friend is playing in the yard now

My friend isn't playing in the yard now

Is my friend playing in the yard now?

2) I'm writing an exercise at the moment

I am not writing an exercise at the moment

Am I writing an exercise at the moment?

3)They're doing homework at present

They aren't doing homework at present

Are they doing homework at present?

4) Look! He's singing at home

Look! He isn't singing at home

Look! Is he singing at home ?

2 упражнение:

1.My friend IS reading A book.

2.I AM drinking tea.

3.They ARE making noise.

4.He IS looking through the window.

5.She IS helping about the house.

6.We ARE watching TV.

7.Granny IS cooking dinner.

8.The birds ARE swimming in the lake.

9.The dog IS sitting at the door.

10.It IS looking at me.

В классе проходили,так что всё правильно 100%