An old man is showing a young boy a washer while they are repairing something.
The man explains to his grandson how to use tools.
Sentence 2 tells us that the young boy is his grandson and that he explains to him how to use tools.
exists s1 x1.(all x2.(n_washer(x2) -> exists e1 p1 s2 x3.(exists e2 x4.(Theme(e2,x4) & Actor(e2,x1) & v_repair(e2) & n_thing(x4)) & while(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_show(e1) & for(x3,x2) & n_boy(x3) & a_young(s2) & Theme(s2,x3))) & n_thing(x1) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e1 p1 p2 x1 x2.(n_grandson(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & to(e1,x2) & Topic(x2,p2) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x2) & v_use(e2) & n_tool(x4)) & exists x3.n_event(x3) & Topic(e1,p1) & Actor(e1,x1) & v_explain(e1))