Answer:
1. Mom said that I had to wait until my birthday to UNWRAP my presents.
2. We had to PREHEAT the oven before we could put the cookies in.
3. John forgot his backpack and had to RETURN home to get it.
4. Ashton was sad because he was UNABLE to get tickets for the concert.
5. Jacob almost fell down because his shoelaces were UNTIED.
I hope this helped you :)