A man wearing a yellow helmet is riding on his red motorcycle.
The man borrowed the helmet from a friend.
Wearing a helmet doesn't mean you have to have borrowed it.
exists e2 e1 s1 s2 x1 x2 x3 x4.(on(e2,x4) & n_motorcycle(x4) & a_red(s2) & Theme(s2,x4) & of(x4,x1) & n_male(x1) & Actor(e2,x1) & v_ride(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & a_yellow(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_helmet(x2) & n_man(x1) & from(e1,x3) & n_friend(x3) & Theme(e1,x2) & Actor(e1,x1) & v_borrow(e1))