A boy in a blue sweatshirt playing Frisbee with two black dogs.
A boy could not see his dogs when he went to school.
A boy could not have been playing Frisbee if the boy could not see..
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & with(e1,x5) & n_dog(x5) & a_black(s2) & Theme(s2,x5) & card_eq_2(x5) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_frisbee(x4) & (x2 = x3) & n_sweatshirt(x2) & a_blue(s1) & Theme(s1,x2) & n_boy(x1))
exists x1 x2.(-exists e1 p1.(exists e2 p2 x1.(exists e3 x3.(to(e3,x3) & n_school(x3) & Actor(e3,x1) & v_go(e3)) & n_male(x1) & when(e2,p2) & Theme(e2,x2) & Actor(e2,x1) & v_see(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_could(e1)) & n_dog(x2) & of(x2,x1) & n_male(x1) & n_boy(x1))