$1$ I bought this/that book 5 days ago.
$2$ The man who talked with Mrs. Lien, is my uncle.
$3$ When I saw Na yesterday, she was driving a car.
$4$ They have known each other for 3 months.
$5$ The bag cannot be lifted by the little boy.
$6$ Mrs. Jones said (that) he would visit Hue with his family the following week.