1. They have been to London. They were in London in 2005.
2. She has been to South Africa. She was in South Africa two years ago.
3. I have been to Wales. I was in Wales last year.
4. He has had breakfast. He had breakfast ten minutes ago.
5. We have finished the work. We finished the work an hour ago.
6. He has cleaned his room. He cleaned his room last Saturday.