A boy swings high under blue sky.
A boy is mowing the lawn.
Mowing and swings are different.
exists e1 s1 s2 x1 x2.(under(e1,x2) & n_sky(x2) & a_blue(s2) & Theme(s2,x2) & a_high(s1) & Manner(e1,s1) & Actor(e1,x1) & v_swing(e1) & n_boy(x1))
exists e1 x1 x2.(n_lawn(x2) & Theme(e1,x2) & Actor(e1,x1) & v_mow(e1) & n_boy(x1))