My brother was sick two days ago
My brother wasn’t sick two days ago.
Was my brother sick two days ago?
He was at school an hour ago
He wasn’t at school an hour ago.
Was he at school an hour ago?
Kate was the children's camp
Kate wasn't the children's camp
Was Kate the children's camp?
Mike and Peter were at the party last night
Mike and Peter weren’t at the party last night.
Were Mike and Peter at the party last night?