Rewrite the sentences using modal verbs could, should, can/can't, mustn't or didn't have to

1. It's forbidden to park your car here.
   You [ ] your car here.

2. It wasn't necessary for Jo to make a donation.

   Jo [ ] make a donation.

3. It's impossible for Alan to get unemployment benefits.

   Alan [ ] unemployment benefits.

4. Is it OK if I borrow your car?

   [ ] I borrow your car?

5. John had the ability to write when he was three years old.

   John [ ] when he was three years old.

6. It's a good idea to hold a fundraiser.

   We [ ] a fundraiser.