6.This is the second time they have written to us about this.
-> This is the second time we have been written about this.
7.Mr. Smith has taught us French for two year.
-> We have been taught French by Mr. Smith for two years.
8.Somebody has taken some of my books away.
->Some of my books have been taken away
9. For the past years, I have done all my washing by hand.
-> For the past years, my hand has been done all washing by me
10. The police haven’t found the murderer yet.
->The murder hasn't been found the police yet