A man makes a call on a cellphone.
A man calls his mother on the telephone.
Answer :The fact that the man is on a cellphone does not mean he is calling his mother.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & on(x2,x3) & n_cellphone(x3) & n_call(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_telephone(x3) & Theme(e1,x2) & Actor(e1,x1) & v_call(e1) & on(x2,x3) & n_mother(x2) & of(x2,x1) & n_male(x1) & n_man(x1))