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