a child is doing a back flip whilst jumping on a trampoline.
A child is watching television while sitting on the couch.
The child is not watching television while sitting on the couch because he's jumping on a trampoline.
exists e1 e2 s1 s2 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_do(e2) & on(e1,x4) & n_trampoline(x4) & Actor(e1,x3) & v_jump(e1) & (x2 = x3) & n_whilst(x2) & a_flip(s2) & Theme(s2,x2) & a_back(s1) & Theme(s1,x2) & n_child(x1))
exists e2 e1 x1 x2 x3.(n_couch(x3) & while(e1,e2) & on(e2,x3) & Actor(e2,x1) & v_sit(e2) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_television(x2) & n_child(x1))