A boy with a tiger t-shirt stands on top of someone in a bed.
A boy is on a bed with his friends.
On top of someone does not necessarily mean with his friends.
exists e1 x1 x2 x3 x4 x5 x6.(on(e1,x4) & of(x4,x5) & in(x5,x6) & n_bed(x6) & n_person(x5) & n_top(x4) & Actor(e1,x1) & v_stand(e1) & with(x1,x2) & n_t-shirt(x2) & of(x2,x3) & n_tiger(x3) & n_boy(x1))
exists p1 x1 x3.(exists x2.(on(x1,x2) & with(x2,x3) & n_bed(x2)) & n_friend(x3) & of(x3,x1) & n_male(x1) & n_boy(x1))