Men riding skateboards.
Three girls are out taking a joy ride in their car.
There are either men or three girls.  The primary activity is either skateboarding or riding in a car.
exists s1 x1 x2 x3.(n_skateboard(x1) & a_.(s1) & Theme(s1,x1) & of(x1,x3) & n_riding(x3) & of(x1,x2) & n_man(x2) & a_topic(x1))
exists e1 s1 x1 x2 x3 x4.(a_out(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & in(x2,x4) & n_car(x4) & of(x4,x1) & n_thing(x1) & n_ride(x2) & of(x2,x3) & n_joy(x3) & n_girl(x1) & card_eq_3(x1))