People are watching a skier perform a trick in the air.
The people watched the skier perform.
People are watching a skier perform is same as people watched the skier perform
exists e1 e2 x1 x2 x3 x4 x5.(n_air(x5) & in(e2,x5) & Theme(e2,x4) & Actor(e2,x1) & v_perform(e2) & n_trick(x4) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & n_skier(x3) & (x1 = x2) & n_people(x1))
exists e1 e2 x1 x2 x3.(n_skier(x3) & n_people(x1) & Actor(e2,x1) & v_perform(e2) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & (x1 = x2))