A baby is crawling around on a sandy floor.
A baby is crawling on a sandy floor about to fall.
Just because the baby is crawling on a sandy floor does not mean that she is about to fall.
exists e1 s1 s2 x1 x2.(on(e1,x2) & n_floor(x2) & a_sandy(s2) & Theme(s2,x2) & a_around(s1) & Manner(e1,s1) & Actor(e1,x1) & v_crawl(e1) & n_baby(x1))
exists e2 e1 p1 s1 x1 x2 x3.(on(e1,x2) & Topic(e2,p1) & Actor(e2,x3) & v_about(e2) & exists e3.(Actor(e3,x3) & v_fall(e3)) & (x2 = x3) & n_floor(x2) & a_sandy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_crawl(e1) & n_baby(x1))