A woman exercises on an elliptical machine.
A woman buys some ice cream.
She can't exercise and buy some ice cream at the same time.
exists e1 s1 x1 x2.(on(e1,x2) & n_machine(x2) & a_elliptical(s1) & Theme(s1,x2) & Actor(e1,x1) & v_exercise(e1) & n_woman(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_buy(e1) & n_cream(x2) & of(x2,x3) & n_ice(x3) & n_woman(x1))