A little boy wearing swim trunks plays in the ocean.
A boy is run over by a jet ski.
The boy who plays in the ocean could not simultaneously be run over by a jet ski.  He would not be playing at the same time
exists e1 e2 s1 x1 x2 x3 x4 x5.(n_ocean(x5) & in(e2,x5) & Actor(e2,x1) & v_play(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_trunk(x3) & of(x3,x4) & n_swim(x4) & (x1 = x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(Actor(e1,x2) & n_ski(x2) & of(x2,x3) & n_jet(x3) & a_over(s1) & Manner(e1,s1) & Theme(e1,x1) & v_run(e1) & n_boy(x1))