A family is sitting in a hut.
A family is water skiing.
Can't water ski from inside a hut.
exists e1 x1 x2.(in(e1,x2) & n_hut(x2) & Actor(e1,x1) & v_sit(e1) & n_family(x1))
exists p1 x1.(exists x2 x3.((x1 = x2) & n_skiing(x2) & of(x2,x3) & n_water(x3)) & n_family(x1))