A man riding his bicycle through a crowded street.
The man could not ride his bike.
If the man could not ride his bike, then he is not riding his bicycle.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & through(e1,x4) & n_street(x4) & a_crowded(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bicycle(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1))
exists x1 x2.(n_bike(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & -exists e1 p1.(exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_ride(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_could(e1)))