A man walking through an empty classroom.
The classroom is large
THE CLASSROOM MAY NOT BE EMPTY
exists e1 s1 x1 x2 x3.(a_topic(x1) & through(e1,x3) & n_classroom(x3) & a_empty(s1) & Theme(s1,x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_man(x1))
exists s1 x1.(n_classroom(x1) & Theme(s1,x1) & a_large(s1))