1) Have you read "Elizabeth is Missing"? It's fantastic!
2) My brother has decided to get a new job. He isn't very happy at work.
3) I haven't studied for the exam. I didn't have time.
4) They have seen the film, but they didn't like it.
5) He hasn't answered my e-mail. Perhaps he's on holiday.
6) Have you called your brother? It's his birthday today.