1. They built this house yesterday
→ This house was built yesterday.
2. You have to sign the paper again.
→ She told me to sign the paper again.
3. What do you want to eat for today, Nam?
→ He asked Nam what he wanted to eat for that day.
4. We do not have a computer with lnternet, so we can not finish the project easily.
→ lf we had a computer with lnternet, we could finish the project easily.