a young couple lying on a bed together
a couple are laying on a mattress.
together doesn't always mean  mattress.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & a_together(s2) & Manner(e1,s2) & on(e1,x3) & n_bed(x3) & Actor(e1,x2) & v_lie(e1) & (x1 = x2) & n_couple(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_mattress(x2) & Actor(e1,x1) & v_lay(e1) & n_couple(x1))