英语翻译

1.He bought this book three days ago.So he has had this book for three days.
2.Have you ever been to Hangzhou?Yes,I went there a month ago.It is a month since I went there last.
3.I haven't seen him since 1966.It is 45 years since I met him last.
4.My father has been working in America for four years.He went there in 1999.