A motocross biker is standing and riding his yellow and red motorcycle.
A biker is fixing his motorcycle
The second biker can't be standing or riding because he is fixing his motorcycle in order to do that.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7.(Theme(e2,x5) & Actor(e2,x3) & v_ride(e2) & n_motorcycle(x7) & a_red(s1) & Theme(s1,x7) & n_yellow(x6) & subset_of(x7,x5) & subset_of(x6,x5) & of(x5,x1) & n_male(x1) & n_biker(x3) & of(x3,x4) & n_motocross(x4) & Actor(e1,x1) & v_stand(e1) & n_biker(x1) & of(x1,x2) & n_motocross(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_fix(e1) & n_motorcycle(x2) & of(x2,x1) & n_male(x1) & n_biker(x1))