My frends (listen) to music now . Какое местоимение нужно добавить

My friends is listening to music now.

Мой друг сейчас слушает музыку.

Is my friend listening to music now?

Is my friend listening to music a reading a book now?

What is my friend doing now?

Who is listening to music now?

My friend is listening to music now, isn\'t he?