a boy in a purple shirt is playing with a toy ans another young boy in a blue shirt is watching him.
The boy in blue is playing with the toy.
If the boy is watching he cannot also be playing with the toy. There are two different number of boys in each cases.
exists e2 e1 e3 s1 s2 s3 s4 x1 x2 x3 x4 x5 x6 x7.(Theme(e3,x2) & Actor(e3,x1) & v_watch(e3) & n_male(x2) & in(x1,x2) & with(e1,x4) & Theme(e2,x6) & Actor(e2,x5) & v_an(e2) & in(x6,x7) & n_shirt(x7) & a_blue(s4) & Theme(s4,x7) & n_boy(x6) & a_young(s3) & Theme(s3,x6) & -(x6 = x1) & n_boy(x1) & n_boy(x1) & a_young(s2) & Theme(s2,x1) & (x4 = x5) & n_toy(x4) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_shirt(x2) & a_purple(s1) & Theme(s1,x2))
exists e1 x1 x2 x3.(n_toy(x3) & n_boy(x1) & with(e1,x3) & Actor(e1,x1) & v_play(e1) & in(x1,x2) & n_blue(x2))