In English we have two forms of grammar:
The Passive Subject + Be +Past Participle +by the agent
The Passive is a useful tense and we have many reasons why we use it.
It is important to understand how the Passive works.
Let us look at Active
Yesterday a dog bit a man. = ACTIVE sentence
Why is it active? Two reasons.
THE SUBJECT DID THE VERB
Let us compare
A man was bitten by a dog. = PASSIVE sentence
Who did the verb? That is right, the dog.
Hang on! The dog is not the subject! So it is passive.
We also have to add ‘BE’ Verb to show the tense.
*Common ‘BE’ verbs