Sentence to passive voice: She have been waiting since 2:00 A.M.

[Logatharshini]

Hi Torsten Daerr,

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[Logatharshini]

Hi Torsten Daerr,

I have a question. How to change the following sentence to passive voice
1. She have been waiting since 2:00 A.M.
2. I had been studyining in this college since 2006.

thankyou.

[Mister Micawber]

They cannot be changed to passive, since they are intransitive verbs. Only transitive verbs can be made passive.
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[Richard]

Hi Mister Micawber.
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[Logatharshini]

Hi Mister Micawber,
Thank you very much for your answer.

I shall be much grateful if you could elaborate your answer with examples,

Does it mean all perfect continuous forms; never accept direct objects and they cannot be changed to passive form?

Thankyou

[Mister Micawber]

'Perfect continuous' has nothing to do with transitivity:

Perfect continuous transitive: 'My wife has been currying my horse.'
Perfect continuous intransitive: 'I have been sleeping.'

The passive form of the perfect continuous transitive verb is grammatically possible but rare to near non-existence-- authentic examples are extremely hard to find: 'My horse has been being curried by my wife all this week.'

There is no passive form of the intransitive verb above.
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Native English teacher at Mister Micawber's