Man working on old truck while child watches.
A man teaching a child how to fix a truck
It can't be inferred that the man is teaching the child. The child can watch without being taught.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & while(e1,x4) & n_watch(x4) & of(x4,x5) & n_child(x5) & on(e1,x3) & n_truck(x3) & a_old(s1) & Theme(s1,x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1))
exists e1 p1 x1 x2 x3.(a_topic(x1) & Topic(x1,p1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x1) & v_fix(e2) & n_truck(x4)) & Theme(e1,x3) & Actor(e1,x2) & v_teach(e1) & n_child(x3) & (x1 = x2) & n_man(x1))