A male surfer catching a nice wave.
A professional male surfer is surfing.
Not all male surfers that surf are professional surfers.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_catch(e1) & n_wave(x3) & a_nice(s2) & Theme(s2,x3) & (x1 = x2) & n_surfer(x1) & a_male(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(Actor(e1,x1) & v_surf(e1) & n_surfer(x1) & of(x1,x2) & n_male(x2) & a_professional(s1) & Theme(s1,x1))