A man and a woman are biking on a sunny day.
A couple is biking.
The man and woman might not be a couple in the relationship sense.
exists e1 s1 x1 x2 x3 x4.(on(e1,x4) & n_day(x4) & a_sunny(s1) & Theme(s1,x4) & Actor(e1,x1) & v_bike(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 x1.(Actor(e1,x1) & v_bike(e1) & n_couple(x1))