1.She has lost her money.
2.When children stand quiet they have done something ill.
3.We have used this method since 1980.
4.I have studied human nature all mу life.
5.When we have carried out an experiment we study the obtained results.
6.We do not know what is good until we have lost it.
7.After we have answered this question, it will be an easy matter to ask another one.
8.Who has bought your car?
9.How long have you lived here?
10. He has never been here before.
