A surfer rides a green wave.
The surfer had been riding waves all morning.
Riding waves all morning is not implied by riding a green wave.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_wave(x2) & a_green(s1) & Theme(s1,x2) & n_surfer(x1))
exists x2.(n_surfer(x2) & all x1.(n_morning(x1) -> exists e1 x3.(Time(e1,x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_wave(x3))))