subjectof the sentence is unknown or is not important.
Object + am / is / are (in present form) or was / were (in past form) or will be / going to be (in future form) + past participle form of verb + .....
The work will be finished soon.
Harvard University was founded in 1636.
English is spoken in many countries around the world.
My bike was stolen in the park.
The cake was made by my sister.
He was attacked by a dangerous dog.