A man is sitting outside on a chair.
A man is mowing his lawn.
One cannot be mowing while sitting.
exists e1 s1 x1 x2.(on(e1,x2) & n_chair(x2) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_mow(e1) & n_lawn(x2) & of(x2,x1) & n_male(x1) & n_man(x1))