1.a)

are

is

is

are

am

are

are

b)

1. are
2. is
3. are
4. is
5. am

2.

1. feeding
2. doing
3. walking
4. washing
5. playing

3. Sam is not sitting on the sofa

The cats are not playing

My mother is not cooking

Her friends are not reading

4.Is Tom drinking coffee now?

Are the boys playing now?

Is the girl skipping now?

Are the cats eating fish?