Three boys use push-brooms to clean a classroom.
Three school children sit and wait for the bus.
The boys can't both clean the classroom and sit at the same time.
exists e1 p1 x1 x2.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_clean(e2) & n_classroom(x3)) & n_push-broom(x2) & n_boy(x1) & card_eq_3(x1))
exists e1 s1 x1 x2 x3 x4 x5.(n_bus(x5) & a_topic(s1) & subset_of(x4,s1) & for(x4,x5) & n_wait(x4) & subset_of(x1,s1) & Actor(e1,x3) & v_sit(e1) & (x1 = x3) & n_child(x1) & of(x1,x2) & n_school(x2) & card_eq_3(x1))