What does he do?
He looks up.
What does the boy hear?
The boy hears a sound.
Does he look up?
Yes, he looks up.
Who sees an airplane?
The boy sees an airplane.
What does he see?
He sees an airplane.
1/ Does the boy hear a sound?
Yes, the boy hears a sound.
Who hears a sound?
The boy hears a sound.
Does he see an airplane?
Yes, he sees an airplane.
Who looks up?
The boy looks up.