A man with white hair is drinking.
Some man is mowing the lawn.
One cannot be drinking and mowing lawn at a go.
exists p1 s1 x1 x2.(exists x3.((x1 = x3) & n_drinking(x3)) & with(x1,x2) & n_hair(x2) & a_white(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_lawn(x2) & Theme(e1,x2) & Actor(e1,x1) & v_mow(e1) & n_man(x1))