1. “Why don’t you complain to the company, Peter?” said William.

- William suggested that Peter complain to the company

2. He started to play the guitar five years ago.

- He has played the guitar for 5 years
3. I am fond of my nephew although he behaves terribly.

- I am fond of my nephew in spite of his terrible behavior

4. I won't swim in the sea because it is too cold.
- The sea is not warm enough for me to swim.
5.  "I was not there at the time," he said.
- He denied that he hadn’t been there at the time. 
6. "Who does that suitcase belong to?" The policeman asked us.
- The policeman asked us whose that suitcase was?
7. She hasn't ridden a horse before.
- It's the first time she has ever ridden a horse