A child hangs upside down on a ladder while another child swings on a rope.
A child is hanging upside now.
"A child hangs" and "A child is hanging" are both the same activity described in present tense.
exists e1 p1 x1 x2 x3 x4 x5 x6.(on(e1,x6) & n_rope(x6) & while(e1,x4) & n_swing(x4) & of(x4,x5) & n_child(x5) & -(x4 = x3) & n_swing(x3) & of(x3,x1) & n_child(x1) & n_child(x1) & on(e1,x2) & n_ladder(x2) & exists s1.(r_upside(s1) & Theme(s1,x1) & a_down(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_hang(e1))
exists e1 s1 x1.(r_upside(e1) & a_now(s1) & Manner(e1,s1) & Actor(e1,x1) & v_hang(e1) & n_child(x1))