Guy riding a bicycle down a grassy trail.
A man rides a bike.
Answer: A guy is a man and where he is riding the bicycle is not relevant, except to say that he is.
exists e1 s1 x1 x2 x3.(ne_nam_guy(x1) & down(e1,x3) & n_trail(x3) & a_grassy(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_man(x1))