A snowboarder wearing a red jacket is going down a mountain.
A guy in a red jacket is riding his snowboard down the mountain.
Not all snowboarders are guys. It cannot be inferred that a snowboarder is riding his or her snowboard just because he or she is going down a mountain.
exists e1 e2 s1 s2 x1 x2 x3 x4.(a_down(s2) & Manner(e2,s2) & Theme(e2,x4) & Actor(e2,x1) & v_go(e2) & n_mountain(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_jacket(x3) & a_red(s1) & Theme(s1,x3) & (x1 = x2) & n_snowboarder(x1))
exists e1 s1 x1 x2 x3 x4.(n_mountain(x4) & down(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_snowboard(x3) & of(x3,x1) & n_male(x1) & in(x1,x2) & n_jacket(x2) & a_red(s1) & Theme(s1,x2) & n_guy(x1))