A kid is riding a bike in an open field.
A child is riding a cool bike in a big field with a lot of people.
Not every bike is cool. An open field doesn't have to be big. Just because there is an open field doesn't mean there are lot of people in it.
exists e1 s1 x1 x2 x3.(in(e1,x3) & n_field(x3) & a_open(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_kid(x1))
exists e1 s1 s2 x1 x2 x3 x4 x5.(with(e1,x4) & of(x4,x5) & n_people(x5) & n_lot(x4) & in(e1,x3) & n_field(x3) & a_big(s2) & Theme(s2,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & a_cool(s1) & Theme(s1,x2) & n_child(x1))