english grammer

How to use been & being in a sentece?
Using of Passive voice

How are “been” and “being” used passively in a sentence?

The letter has been written.
The letter is being written.
The letter has been written.
The letter was being written.
The letter had been written.
We are used to being driven by him.

If either is followed by past participle, it is being used passively. The passive voice has been used in all these.