A person walking on a path while using a cane.
A person riding a bike.
A person cannot be walking and riding a bike the same time.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & while(e1,e2) & Theme(e2,x4) & Actor(e2,x2) & v_use(e2) & n_cane(x4) & on(e1,x3) & n_path(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_person(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & (x1 = x2) & n_person(x1))