A couple of graduate students in white suits started something on fire.
Something is on fire.
If somebody starts something on fire, then something will be on fire.
exists e1 s1 s2 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_start(e1) & on(x4,x5) & n_fire(x5) & n_thing(x4) & in(x1,x3) & n_suit(x3) & a_white(s2) & Theme(s2,x3) & of(x1,x2) & n_student(x2) & a_graduate(s1) & Theme(s1,x2) & n_couple(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_fire(x2)) & n_thing(x1))