A mountain biker rides through a shady trail.
A mountain biker is competing in a race
You can not infer they are competing.
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 x1 x2 x3.(in(e1,x3) & n_race(x3) & Actor(e1,x1) & v_compete(e1) & n_biker(x1) & of(x1,x2) & n_mountain(x2))