A man is sharpening a knife.
A man is honing a blade.
Sharpening is honing. A knife is a blade.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_sharpen(e1) & n_knife(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hone(e1) & n_blade(x2) & n_man(x1))