Two boys are holding up their dirty hands while standing on the beach.
two boys hold up their sandy hands while standing outside
Two boys are holding up their sandy hands while standing on a beach is rephrasing of standing outside.
exists e2 e1 s1 x1 x2 x3 x4.(n_beach(x4) & while(e1,e2) & on(e2,x4) & Actor(e2,x1) & v_stand(e2) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_hand(x2) & of(x2,x3) & n_dirty(x3) & of(x2,x1) & n_thing(x1) & n_boy(x1) & card_eq_2(x1))
exists e2 e1 s1 s2 s3 x1 x2.(while(e1,e2) & a_outside(s3) & Manner(e2,s3) & Actor(e2,x1) & v_stand(e2) & a_up(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_hand(x2) & a_sandy(s1) & Theme(s1,x2) & of(x2,x1) & n_thing(x1) & n_boy(x1) & card_eq_2(x1))