A man on a motorcycle is in the middle of a jump.
A motorcyclist is jumping.
A man on a motorcycle is a motorcyclist. Someone in the middle of a jump is jumping.
exists p1 x1 x2 x3.(n_middle(x3) & exists x4.(in(x1,x3) & of(x3,x4) & n_jump(x4)) & on(x1,x2) & n_motorcycle(x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_jump(e1) & n_motorcyclist(x1))