Three people ride off-road bikes through a field surrounded by trees.
Three boys enjoying a bike ride on summer vacation.
People can ride off-road bikes for many reasons, not always enjoying the ride.  They can also ride them at any time, not just summer vacation.
exists e2 e1 s1 x1 x2 x3 x4 x5.(through(e1,x3) & Actor(e2,x5) & n_tree(x5) & Theme(e2,x4) & v_surround(e2) & (x3 = x4) & n_field(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & a_off-road(s1) & Theme(s1,x2) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_enjoy(e1) & on(x3,x5) & n_vacation(x5) & of(x5,x6) & n_summer(x6) & n_ride(x3) & of(x3,x4) & n_bike(x4) & (x1 = x2) & n_boy(x1) & card_eq_3(x1))