A woman with a white head cover rides a bike on the sidewalk in a city.
The woman is skiing down a mountain.
One is not riding and skiing at the same time.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_sidewalk(x5) & Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & on(x4,x5) & in(x5,x6) & n_city(x6) & n_bike(x4) & with(x1,x2) & n_cover(x2) & of(x2,x3) & n_head(x3) & a_white(s1) & Theme(s1,x2) & n_woman(x1))
exists e1 s1 x1 x2.(n_woman(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ski(e1) & n_mountain(x2))