A man riding his bike across the bridge that is over the river.
a man rides a bike
man riding his bike is same as man rides a bike
exists e1 p1 x1 x2 x3 x4 x5 x6.(n_river(x6) & n_bridge(x4) & a_topic(x1) & across(e1,x4) & over(x5,x6) & (x4 = x5) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_man(x1))