A boy performs a high-flying trick with his bicycle on a prepared course.
A boy is sitting on a couch.
A boy cannot be sitting while he performs a trick on his bicycle. A course is not a couch.
exists e1 s1 s2 x1 x2 x3 x4.(with(e1,x3) & on(x3,x4) & n_course(x4) & a_prepared(s2) & Theme(s2,x4) & n_bicycle(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & a_high-flying(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2.(on(e1,x2) & n_couch(x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1))