A man and woman wearing sunglasses are window shopping.
A man and woman are window shopping while snow flakes fall.
A man and woman could be window shopping without snow flakes falling.
exists e1 p1 x1 x2 x3 x4 x5.(exists x6 x7.((x1 = x6) & n_shopping(x6) & of(x6,x7) & n_window(x7)) & Theme(e1,x5) & Actor(e1,x4) & v_wear(e1) & n_sunglass(x5) & (x1 = x4) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists p1 p2 x1 x2 x3.(exists e1 x6 x7.(Theme(e1,x7) & Actor(e1,x6) & v_flake(e1) & n_fall(x7) & n_snow(x6)) & while(p1,p2) & exists x4 x5.((x1 = x4) & n_shopping(x4) & of(x4,x5) & n_window(x5)) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))