A: What are you doing?

B: (a)   . (erase)

A: What is he doing?

B: (a)   . (count)

A: What are they doing?

B: (a)   . (talk)

A: What are you doing?

B: We (a)   . (draw)

A: What is she doing?

B: (a)   . (listen)

A: What is he doing?

B: (a)   . (listen)