`1.` The groundbreaking research was published in a prestigious journal.

`=>` Researchers published the groundbreaking research in a prestigious journal.

`-` Chuyển từ cau bị động QKĐ `>` chủ động:

`-` Bị động: was/were + Vpp

`-` Chủ dộng Ved/ cột `2`

`2.` The beautiful artwork was displayed in a museum.

`=>` A museum displayed the beautiful artwork.

`-` Như câu `1`
`3.` She had told her son to carry the shopping to the house.

`=>` She had her son carry the shopping to the house.

`-` Cấu trúc: Have someone do something: khiến ai đó làm gì

`4.` We used to employ a cleaner who cleaned the windows.

`=>` We used to have a cleaner clean the windows.

`-` Như câu `3-` Cấu trúc: Have (chia) someone do something: khiến, nhờ ai đó làm gì

`5.` The builders are putting a new roof on Adam's house at the moment.

`=>` Adam is having a the builders put a new roof on his house at the moment.  

`-` Tương tự câu `4,5` : at the moment `>` Thì HTTD: is having

`6.` A plumber fixed the dripping tap for Joe.

`=>` Joe had a plumber fix the dripping tap.

`7` `=>` He had the maid polish the shoes.