A mountain biker rides through a shady trail.
Someone is riding a stationary exercise bike
A mountain biker through a shady trail is not riding a stationary exercise bike.
exists e1 s1 x1 x2 x3.(through(e1,x3) & n_trail(x3) & a_shady(s1) & Theme(s1,x3) & Actor(e1,x1) & v_ride(e1) & n_biker(x1) & of(x1,x2) & n_mountain(x2))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x3) & n_exercise(x3) & a_stationary(s1) & Theme(s1,x2) & n_person(x1))