I/ 1. She’d live in London if she knew someone there.
2. I’d live in the country if I could find a job there.
3. If I had a spare ticket, I’d take you to the concert.
4. If they understood the problem, they’d find the solution.
5.If he didn’t sit around too much, he’d be fit.
II
1-> Brenda is a friend with whom I went on holiday
2-> This is Mr Smith, whose son plays in our team
3-> Her book which became a best seller was published last year
4-> This is the bank from which we borrowed the money
5-> I told you about the person who is at the door