Two men are sitting on camp chairs while reading or studying.
some men standing in a park
Some may not just be two. They are either sitting or standing, they cannot do both simultaneously.
exists e1 x1 x2 x3 x4.(while(e1,x4) & (n_read(x4) | n_study(x4)) & on(e1,x2) & n_chair(x2) & of(x2,x3) & n_camp(x3) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_park(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_man(x1))