1.He has just bought a new car .
=>A new car has just been bought (by him).
2.She has studied English for six year
=>English has been studied by her for six years.
3They have just introduced a new style of jeans.
=>A new style of jeans has just been introduced.
4.We've repaired out house since last month.
=>Out Our house has been repaired by us since last month
5.Someone has just stolen my bike.
=>My bike has just been stolen
6.He has just killed his wife.
=>His wife has just been killed by him.
7.We've built this have for a year.
=>This has been built by us for a year.
8.I have raised these dogs for ten year.
=>These dogs have been raised by me for ten years
9.My father has forty has used that bike for forty years.
=>That bike has been used by my father for forty years
10.How long have you studied English?
=>How long have you been studying English ?
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