vi.1.it took him two hours to do his homework

2.the boy suggested going out for lunch

3.a new school will be built next month

4.it is not easy to find an apartment in a big city

5.it rained heavily so they were late for school

vii.1.lan helps her mother with housework everyday

2.it is necessary for everyone to protect the environment

3.hung would go to school on time if he had an alarm clock

4.they haven't seen each other since they left csool

5.my brother prefers playing tennis to watching it

VI. 1. It took him two hours to do his homework

2. The boy suggested to his father that they should go out for lunch

3. A new school will be built next month

4. It is not easy to find an apartment in a big city

5. It rained heavily so we were late for school

VII. 1. Lan helps her mother do housework every day

2. It is necessary that everyone should protect the environment

3. Hung would go to school on time If he had an alarm clock

4. They have not seen each other since they left school

5. My brother prefers playing tennis to watching it