A person in a white sweatshirt sits on a ladder.
A person is wearing a purple sweatshirt while standing up.
White is not purple. One cannot sit on a ladder while standing up.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_ladder(x3) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_sweatshirt(x2) & a_white(s1) & Theme(s1,x2) & n_person(x1))
exists e2 e1 s1 s2 x1 x2.(while(e1,e2) & a_up(s2) & Manner(e2,s2) & Actor(e2,x1) & v_stand(e2) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_sweatshirt(x2) & a_purple(s1) & Theme(s1,x2) & n_person(x1))