A man is using a homemade hot tub.
A man is building a hot tub.
A man can't  be building and use a hot tub at the same time.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_tub(x2) & a_hot(s1) & Theme(s1,x2) & of(x2,x3) & n_homemade(x3) & n_man(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_tub(x2) & a_hot(s1) & Theme(s1,x2) & n_man(x1))