A man teaches a classroom of children.
A man is in a classroom.
It's implied that a man is in a classroom teaching children.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_teach(e1) & of(x2,x3) & n_child(x3) & n_classroom(x2) & n_man(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_classroom(x2)) & n_man(x1))