2. We got lost because we didn't have a map
→ If we had had a map, we wouldn't have lost.
3. I would prefer you to deliver the sofa on Friday.
→ I would rather you deliver the sofa on Friday.
4.The bridge was so low that the bus couldn't go under it
→ It was a low bridge,so the bus couldn't go under it
5. that was a silly thing to say
What a silly thing to say!