Whats the rule that makes "please" pronounced the same as "p...

Pleas is spelled <pleas> because it's the plural of pleas.

You'll usually find your answer there.

Back in the day (circa 1300), it was written <plesen>.

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Whence the <ea> I cannot say but some other words that were spelled <ai> in French are spelled <ea> in English: aise → ease, graisse → grease, fait → feat.

There's no rule.

Please is an anglicization of the French word plaisir.

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While you may reasonably ask why words are spelled the way they're spelled, it makes no sense to ask why they're pronounced the way they're pronounced.

If you're curious about why a word is spelled the way it's spelled, your first recourse should be etymonline dot com.

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Words are pronounced the way that they're pronounced.

Whats the rule that makes "please" pronounced the same as "pleas"?

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