a man doing tricks on a bmx bike
A man fell off his bike.
A man could fall off his bike AFTER doing tricks on a bike, but he can not be both doing tricks and falling off at the same time.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & on(e1,x4) & n_bike(x4) & of(x4,x5) & n_bmx(x5) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_trick(x3) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2.(a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_fall(e1) & n_bike(x2) & of(x2,x1) & n_male(x1) & n_man(x1))