A man rides his dirt bike.
A person going off jumps on his dirtbike
Not all men riding a dirt bike is going off jumps in his dirtbike
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_dirt(x3) & of(x2,x1) & n_male(x1) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & a_off(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_go(e1) & on(x3,x4) & n_dirtbike(x4) & of(x4,x1) & n_male(x1) & n_jump(x3) & (x1 = x2) & n_person(x1))