A young male with a black helmet and elbow guards does a bike trick.
A person is on a bike.
male implies person and bike trick implies being on a bike
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(Theme(e1,x6) & Actor(e1,x1) & v_do(e1) & n_trick(x6) & of(x6,x7) & n_bike(x7) & with(x1,x2) & subset_of(x4,x2) & n_guard(x4) & of(x4,x5) & n_elbow(x5) & subset_of(x3,x2) & n_helmet(x3) & a_black(s2) & Theme(s2,x3) & n_male(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_bike(x2)) & n_person(x1))