A woman in a red dress is signing while a man in a suit is playing the saxophone.
The couple were snorkeling off Great Barrier Reef
If the woman is singing and the man is playing the saxophone they cannot be snorkeling at the same time.
exists e1 p1 s1 x1 x2 x5.(n_saxophone(x5) & exists e2 x3 x4.(Theme(e2,x5) & Actor(e2,x3) & v_play(e2) & in(x3,x4) & n_suit(x4) & n_man(x3)) & while(e1,p1) & Actor(e1,x1) & v_sign(e1) & in(x1,x2) & n_dress(x2) & a_red(s1) & Theme(s1,x2) & n_woman(x1))
exists e1 s1 x1 x2 x3 x4.(ne_org_reef(x2) & (x2 = x4) & ne_org_barrier(x4) & (x2 = x3) & ne_org_great(x3) & n_couple(x1) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_snorkele(e1))