The sentences don't sound very natural to me. Consider these versions: CharmYou I can't hear a sound This is fine. CharmYou I have no right to demand of his time.
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CharmYouI can't hear a sound This is fine.
CharmYouI have no right
CharmYouI have no right to make a demand/demands on his time.Both are possible, and they mean about the same, but the plural would be more common.
CharmYouIt's impossible to eat an apple/apples in this season.Both seem possible, but I'm wondering what the context of this is, and whether it is the right thing to say at