1. The last time I talked to him was last week. 

   => I haven’t talked to him since last week.

2. “Don’t leave the house until I get back, John”, his mother said.

   => John’s mother told him not to leave the house until she got back.

3. I can’t believe that he passed the exam

   => I find it hard to believe that he passed the exam.

4. It was such a boring film that she fell asleep.

   => The film was so boring that she fell asleep.

5. He is determined to carry on working when he is 66. 

   => He has no intention of retiring when he is 66.

6. You must hand in your report before the end of this month.

   => Your report must be handed in before the end of this month.

7. Unless he phones immediately, he won’t get any information.

   => If he doesn't phone immediately, he won't get any information.

8. “I’m sorry I didn’t phone you earlier ” Jane said to me

   => Jane apologized for not phoning me earlier.

9. "You'd better do morning exercise, Minh", said the doctor.  

   => The doctor advised Minh to do morning exercise.

10. It’s thought that the accident was caused by human error.

   => The accident is believed to have been caused by human error.