VI/
1. She said she were working in a restaurant.
2. If Hoa weren't busy now, she could help her mother with the housework.
3. They suggested that advertisements should be banned on TV.
4. Not only does he sing well but also dances beautifully.
VII/
1. It is necessary to learn English nowadays.
2. My sister failed her exam because of her laziness.
3. If you study hard, you won't fail the exam.
4. Watching television may discourage people taking exercises and playing sports.