A man riding a vary tall bike.
It's a mountain bike
doesn't say it is a mountain bike
exists e2 e1 x1 x2 x3 x4.(r_tall(e2) & Time(e2,x4) & n_bike(x4) & Actor(e2,x1) & v_vary(e2) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_a(x3) & (x1 = x2) & n_man(x1))
exists p1 x1.(n_thing(x1) & exists x2 x3.((x1 = x2) & n_bike(x2) & of(x2,x3) & n_mountain(x3)))