Answer:
a. He and his mother are singing.
b. She is at his mother ook
c. They are playing the electric guitar
Explanation:
a)
He and his mother are singing.
b)
She is at his mother ook
c)
They are playing the electric guitar
Reason -
The present continuous verb tense indicates that an action or condition is happening now, frequently, and may continue into the future.
For example -
He is swimming
I am singing at church today.
