A young child is on all fours inside.
A youth is pretending to be a polar bear.
A young child on all fours may not be pretending to be a polar bear.
exists p1 s1 s2 x1.(a_inside(s2) & Manner(p1,s2) & all x2.(n_fours(x2) -> on(x1,x2)) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_pretend(e1) & exists p2 s1 x2.((x1 = x2) & n_bear(x2) & a_polar(s1) & Theme(s1,x2)) & n_youth(x1))