Упражнение 3
Billy is longer than Bobby. He is thinner than Bobby. He is younger, too.
His hat a smaller then Bobby's. His shoes are less and his jacket is shorter.
Упражнение 4
Bobby is shortter than Billy. He is fatter than Billy. He is older, too.
His hat is bigger than Billy's. His shoes are bigger and his jacket is longer.
Как-то так =)