A group of men and women eating and drinking.
They are all drinking water.
Drinking does not imply they are drinking water.
exists x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & of(x1,x2) & n_drinking(x7) & n_eating(x6) & subset_of(x7,x4) & subset_of(x6,x4) & of(x4,x5) & n_woman(x5) & n_man(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_group(x1))
exists p1 x1.(n_thing(x1) & all x2 x3.((n_water(x2) & of(x2,x3) & n_drinking(x3)) -> (x1 = x2)))