Form, function and phonological aspects of these items. Check my answers.

1. She used to have long hair.
2. I was having a bath when the phone rang.
3. I wish I had worked harder.

1) Form=used to. She'd had long hair
2) Form=having a. ?
3) Form=I had.    I wish I'd worked  
                  harder.

I think I need more information can you help please.