Two boys are riding their bikes on the street.
Two boys are eating lunch.
eating lunch and riding bikes are different activites
exists e1 x1 x2 x3.(n_street(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x1) & n_thing(x1) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_lunch(x2) & n_boy(x1) & card_eq_2(x1))