A man and a woman are among many walking down the sidewalk.
Two people sleep in the grass.
You can not walk and sleep at the same time.  The sidewalk and grass are two different places.
exists p1 x1 x2 x3 x6.(n_sidewalk(x6) & exists e1 s1 x4 x5.(among(x1,x4) & a_down(s1) & Manner(e1,s1) & Theme(e1,x6) & Actor(e1,x5) & v_walk(e1) & (x4 = x5) & n_many(x4)) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_sleep(e1) & n_people(x1) & card_eq_2(x1))