Question

he knows us change into passive voice​

Answer 1

Answer:

we are known to him......

Answer 2

Answer:

We are known by him.

Explanation:

Question:

he knows us-change into passive voice.

Answer:

We are known by him.

*In the Active voice the subject is the "doer"

*In the Passive voice the subject is the "sufferer"

*While changing a sentence from Active to Passive voice,we have to add a "be" form verb and the past participle of the main verb should be used in the passive form.

*So the answer is,

We are known by him.