Para responder às questões de números 51 a 54 considere o texto abaixo.
In passive verb phrases of the type can be called
there are a modal verb, an auxiliary verb and a verb in the past tense.
the auxiliary verb have may correctly replace the verb be.
the auxiliary verb takes the form have been if there is a past reference.
the agent of the action must necessarily be left implicit.
there is no verb in the past participle because there is no irregular verb.
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