Learn English – Pencil you in on/for Sunday evening

grammarprepositionsword-choice

When planning an appointment for a specific day (and time), for example, should on or for preposition be used? See the context below, though, I am guessing, the rule should be universal:

Sure, I will tentatively pencil you in for Sunday evening.

Is there change in meaning if I use on above? I picked for simply because it sounds better — and more intuitive.

Best Answer

"For" is more natural to my ear.

Also "on" would be potentially ambiguous, as it might have the meaning "When it gets to Saturday, I will pencil you in". Not a very likely reading, I admit, but there may be cases where the ambiguity is more likely.

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