A man and a woman are riding bikes in front of a building.
a man and a woman riding bikes
Riding books is a rephrasing of are riding bikes.
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 s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & n_bike(x2) & of(x2,x4) & n_riding(x4) & of(x2,x3) & n_woman(x3) & subset_of(x1,s1) & n_man(x1))