A boy drinks from the water hose.
A boy is thirsty.
He does not necessarily have to be thirsty to be drinking.
exists x1 x2 x3 x4.(n_hose(x3) & of(x3,x4) & n_water(x4) & a_topic(x1) & from(x1,x3) & n_drink(x1) & of(x1,x2) & n_boy(x2))
exists s1 x1.(Theme(s1,x1) & a_thirsty(s1) & n_boy(x1))