Which sentences are correct?1.I was told that water boils at 100

Which sentences are correct?
1.I was told that water boils at 100 degrees.
2.He advised his friends that they visit this church when they are in Swansee.
3.They suggested going for a swim later on.
4.Robert regretted to have mentioned the news to his family.
5.I informed everyone that the meeting had been cancelled.
6.Mary said to me that she was watching a film at that time.