Voz Passiva + Verb Patterns: Present Perfect Continuous

Hey guys, how are you doing?
So, a student of mine has just asked me how he could write the sentence below using the passive voice and I had the feeling that the way he'd suggested was fine but I couldn't quite explain why. It just feels right. Could anyone help me?

Active: "They believe that she has been telling the truth."
Passive: "She is believed to have been telling the truth"

The use of believe asks for an object + a verb in the infinitive with TO form, right?
"I believe her to be telling the truth"

Could you give some other examples in which the structure to have been + [verb+ing] appears in a passive sentence?

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Avatar do usuário Telma Regina 22565 8 59 566
As far as I know, there are two ways of writing the passive form in this case. It's the "impersonal passive" and verbs like think, believe, say, report, know, expect, consider, understand, are used in these constructions.

Active: "They believe that she has been telling the truth".
Passive 1: "She is believed to have been telling the truth".
Passive 2: "It is believed that she has been telling the truth".

The passive verb form of the present continuous tense to have been + [verb+ing] is a weird construction and rare in the passive:

Active: John has been telling me for ages that you are leaving.
Passive: I have been being told (by John) for ages that you are leaving.

Reference:
Advanced Grammar in Use, Second Edition, Page 224, Cambridge Press
http://passivecausality.weebly.com/pers ... tions.html
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