1.a)
are
is
is
are
am
are
are
b)
- are
- is
- are
- is
- am
2.
- feeding
- doing
- walking
- washing
- 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?