In some sentence such as
"He should be hired for this job"
"He should hired for this job"
When should "be" be used, or not?
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There are many situations when we need to use a be-verb, and passive voice sentences like this one are one situation.
It is easiest to explain this starting with the equivalent active voice sentence:
We should hire him for this job.
we is the subject, hire is what we are doing, and him is the object.
When you convert a sentence to passive voice, you discard the subject, more the object to the front, and replace the verb with a be-verb and a past participle:
He should be hired for this job.