a man drags a boat from underneath the trees to the shore.
A fisherman starts his morning by fishing on his boat
Just because a man drags a boat to the shore does not mean he is a fisherman.  The man does not have to drag the boat in the morning, or be using it to go fishing.
exists e1 x1 x2 x3 x4 x5.(n_shore(x5) & n_tree(x3) & Theme(e1,x2) & Actor(e1,x1) & v_drag(e1) & from(x2,x3) & to(x3,x5) & Time(x3,x4) & n_underneath(x4) & n_boat(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_boat(x4) & of(x4,x1) & n_male(x1) & n_male(x1) & by(e1,x3) & n_fishing(x3) & Theme(e1,x2) & Actor(e1,x1) & v_start(e1) & n_morning(x2) & of(x2,x1) & n_fisherman(x1))