Ответ:
1. She asked Nam whether her sister and brother went to the same school.
2. Mrs. Nga asked Mr. Ha if he would leave (there) for Japan the next day.
3. The boys said they had to try their best to win the match.
4. Mary asked Peter what he wanted for lunch that day.
5. The newspapers are delivered by John every morning.
6. We have known each other very well for a long time.
7. Some vegetables were being bought by my sister at 11 a.m. yesterday.
8. This present wasn't given to Mary (by him) on her last birthday.