现在完成时的句子

1.I have answered the quesion .
2.The quesipn has been solved .
3.Computer has been invited for many years.
4.Have you been to the USA?
5.He has gone to home.
6.My mother has been to Canada.
7.Sally has just moved to our town.
8.I have studied English for 10years.
9.Our schoold has been built since 1864.
10.Your sister has gone to USA