مفعول به + is/am/are(في المضارع) was/were (في الماضي)+ being +by +الفاعل.
The ball were being kicked by the player.
The tea was being brought by the hostess when she felt down.
The windows are being opened by the teachers.
Some trees are being planted by the farmer.
Many flowers were being put in the room.
The new midicine is being discussed by the scientists.
A plate is being washed.
While the stories were being read by the children, some tea was being made by Malak.