If the 'we' is important, then leave it in the active.

Interested in Language
I've got a problem with changing this sentence into passive :
We hope they will send us an invitation
Can I change it into personal construction?
They are hoped to send us an invitation.
We is a problem here. It isn't hoped in general by people. It is a quite specific personal hope because "We hope".
I know I can say:
We hope to be sent an invitation
And probably:
We hope taht an invitation will be sent to us.
But what about the personal construction?
If the 'we' is important, then leave it in the active.
Why do you want to change a perfectly good sentence into a contrived passive form?
Rover
Thank you :)
But is it just unnatural and silly or is it a grammatical mistake?
So not all of the reporting verbs can be used in both personal and impersonal constructions.
The author of this is wrong (Look at the sentence number 16 in the key):
http://www.eoioviedo.org/anacarmen/passive/Passive.pdf
Of course, I know that many of the information on the Internet is wrong :)
You should only trust pages that seem authoritative, for example university websites. This pdf is written by Ana Carmen. Who is Ana Carmen and what are her qualifications? No one knows because she seems to be a private freelancer who has put up a page with some grammar rules on it. She says nothing about herself.
I'd call her sentences starting "People believe ... " unnatural, as in "People believe that thousands of birds died."
This is the sort of site you should be looking for: Welcome to the Purdue University Online Writing Lab (OWL)
But sentences starting "People believe ..." are common in grammar books.
You have to change such a sentence into personal construction and the right answer is "He is believed to win" or "The missing jewellery is believed to have been found"
As a learner I have no idea what sounds unnatural and what doesn't.
But from a purely grammatical point of view, "He is believed to win" or "He is hoped to win" is correct, isn't it?
It probably sounds silly, nobody uses such sentences but theoretically it's ok. Right?