Children are learning about a firetruck.
The children might be in school
Children don't have to be in school to be learning about a firetruck.
exists e1 x1 x2.(about(e1,x2) & n_firetruck(x2) & Actor(e1,x1) & v_learn(e1) & n_child(x1))
exists e1 p1 x1.(n_child(x1) & exists p2 x2.(in(x1,x2) & n_school(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_might(e1))