A young main is using an Apple computer.
The man is using his teachers Apple computer
A man does not have to be young.
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_computer(x2) & (x2 = x3) & ne_nam_apple(x3) & n_main(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(n_computer(x2) & (x2 = x4) & ne_nam_apple(x4) & of(x2,x3) & n_teacher(x3) & of(x2,x1) & n_male(x1) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1))