Three teenagers are carrying wood down a street while one of the teenagers is smiling at the camera.
Three teenagers are carrying firewood.
The first sentence doesn't imply what the wood is for or that it is firewood specifically.
exists e1 p1 x1 x2 x3 x5.(n_camera(x5) & exists e2 x4.(at(e2,x5) & Actor(e2,x4) & v_smile(e2) & of(x4,x1) & n_thing(x4) & card_eq_1(x4)) & n_teenager(x1) & n_teenager(x1) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & down(x2,x3) & n_street(x3) & n_wood(x2) & card_eq_3(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & n_firewood(x2) & n_teenager(x1) & card_eq_3(x1))