1. I had a lot of money but I lost it all when my business failed.
=> i used to have a lot of money
2. I quite like classical music now,although I wasn't keen on it when I was younger.
=> i didn't use to like classical music
4. Dennis gave up smoking three years ago.
=> Dennis used to smoking three years
5. My brother had his hair cut short when he joined the army.
=>My brother used to have his hair cut short when he joined the army
6. My parents lived in the USA when they were young.
=> My parents used to live in the USA