1. This necklace belonged to my mother-in-law.
⇒ This is my mother-in-law's necklace.
2. I don’t like being alone in the house at night.
⇒ I don’t like staying at home alone.
3. If you decorate the house on your own, it will be cheaper.
⇒ If you decorate by yourself, it will be cheaper.
4. No one helped me repair the roof, you know.
⇒ I repaired the roof on my own.
5. Grahambell was the man who invented the telephone, wasn’t he?
⇒ Grahambell was the inventor of the phone, wasn’t he?
6. He prefers to live alone rather than share a flat.
⇒ He prefers to live on on his own.