A smiling, shirtless boy in flip-flops is popping a wheelie on his bike.
A boy performing bike tricks.
Popping a wheelie does not imply doing tricks necessarily.
exists e1 s1 s2 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_pop(e1) & on(x4,x5) & n_bike(x5) & of(x5,x1) & n_male(x1) & n_wheelie(x4) & in(x1,x3) & n_flip-flop(x3) & n_boy(x1) & a_shirtless(s2) & Theme(s2,x1) & a_,(s1) & Theme(s1,x1) & of(x1,x2) & n_smiling(x2))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_trick(x3) & of(x3,x4) & n_bike(x4) & (x1 = x2) & n_boy(x1))