A man and a woman are riding bikes in front of a building.
a couple riding bikes
Not every man and woman are a couple.
exists e1 x1 x2 x3 x4 x5 x6.(in(e1,x5) & of(x5,x6) & n_building(x6) & n_front(x5) & Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & n_bike(x4) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists x1 x2 x3.(a_topic(x1) & n_bike(x1) & of(x1,x3) & n_riding(x3) & of(x1,x2) & n_couple(x2))