A man with a backpack is observing an alligator.
The man is looking
In order for a man to be observing an alligator, the man must be looking.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_observe(e1) & n_alligator(x3) & with(x1,x2) & n_backpack(x2) & n_man(x1))
exists e1 x1.(n_man(x1) & Actor(e1,x1) & v_look(e1))