A man with helmet and backpack standing on dirt bike in a hilly grassy area.
He is on his dirt bike and forgot to wear his helmet.
A man with a helmet might be wearing it or holding it, there is no reason to infer that he forgot to wear his helmet.
exists s1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & with(x1,x2) & subset_of(x4,x2) & on(x4,x6) & in(x6,x8) & n_area(x8) & a_grassy(s1) & Theme(s1,x8) & r_hilly(x8) & n_bike(x6) & of(x6,x7) & n_dirt(x7) & n_standing(x4) & of(x4,x5) & n_backpack(x5) & subset_of(x3,x2) & n_helmet(x3) & n_man(x1))
exists p1 x1 x3 x4 x6.(n_helmet(x6) & of(x6,x1) & n_male(x1) & n_male(x1) & n_male(x1) & n_bike(x3) & of(x3,x4) & n_dirt(x4) & of(x3,x1) & exists p2 x2 x5.(on(x1,x2) & subset_of(x5,x2) & Topic(x5,p2) & exists e1.(Theme(e1,x6) & Actor(e1,x5) & v_wear(e1)) & n_forgot(x5) & subset_of(x3,x2)))