Can we say Avons-nous to mean "Have we" rather that "Est-ce'qu on a " ?
Freeform Writing Exercise A2
In everyday speech, in a family situation, you would rarely use the 'nous' form but 'on' instead.
The inversion of subject and verb with 'on' is given as a possibility although rare again as it sounds more formal too.
I hope this helps
In face-to-face contact perhaps it is more clear to signal a question with qu'est-ce que ... To use the inversion question construction is perhaps best used in the written word as I understand it.
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