An adult is assisting a child in the act of ice-skating.
The boy is sitting on the couch while his father is skating.
If the adult is skating, he is not assisting the child.
exists e1 x1 x2 x3 x4.(n_act(x3) & in(e1,x3) & of(x3,x4) & n_ice-skating(x4) & Theme(e1,x2) & Actor(e1,x1) & v_assist(e1) & n_child(x2) & n_adult(x1))
exists e1 p1 x1 x2 x3.(n_father(x3) & of(x3,x2) & n_male(x2) & n_couch(x2) & n_boy(x1) & exists e2.(Actor(e2,x3) & v_skate(e2)) & while(e1,p1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))