The book was being written by Jim. Jim had been writing a book. The book had been being written by Jim. 4 Don't be fooled by an adverb intervening between the form of be and the participle. The sentence Jim is carefully writing a book still has a progressive verb in the active voice, and The book is being carefully written by Jim still has its verb in the passive voice.
Some passive constructions use get instead of be with a past participle.
In some of these sentences the subject may have a somewhat active role even when being acted upon by the verb. Thus you might say The kitten got left in the basement, which is no different from The kitten was left in the basement. But the sentence Michelle got hired as a reporter implies that Michelle's actions were instrumental in her securing the job. This passive with get is mostly limited to informal speaking and writing. One big reason for being aware of passive and active verbs in your writing is that overrelying on the passive voice can lead to prose that is boring, difficult to understand, and needlessly verbose.