Two students at work in a science class.
They are at home playing video games
Working and playing are two different actions. A science class and home are two different locations.
exists x1 x2 x3 x4.(a_topic(x1) & at(x1,x2) & in(x2,x3) & n_class(x3) & of(x3,x4) & n_science(x4) & n_work(x2) & n_student(x1) & card_eq_2(x1))
exists p1 x1.(n_thing(x1) & exists e1 x2 x3 x4.(at(x1,x2) & n_game(x2) & of(x2,x4) & n_video(x4) & Actor(e1,x2) & v_play(e1) & of(x2,x3) & n_home(x3)))