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Basically the answer is that naïve is sometimes spelled with the diaresis because it is derived from French which spells it that way. It is actually very uncommon for native English speakers to spell it with the diaresis, largely because, as you've noticed, the diaresis is not normally a part of the English language. The vast majority of English keyboards don't even contain a modifier to add a diaresis (or a tilde, accent, or any other marking, for that matter) to a letter. However, the auto-correct feature in some computer programs will change naive to naïve, as my browser has done in this post.

Basically the answer is that naïve is sometimes spelled with the diaresis because it is derived from French which spells it that way. It is actually very uncommon for native English speakers to spell it with the diaresis, largely because, as you've noticed, the diaresis is not normally a part of the English language. English keyboards don't even contain a modifier to add a diaresis (or a tilde, accent, or any other marking, for that matter) to a letter. However, the auto-correct feature in some computer programs will change naive to naïve, as my browser has done in this post.

Basically the answer is that naïve is sometimes spelled with the diaresis because it is derived from French which spells it that way. It is actually very uncommon for native English speakers to spell it with the diaresis, largely because, as you've noticed, the diaresis is not normally a part of the English language. The vast majority of English keyboards don't even contain a modifier to add a diaresis (or a tilde, accent, or any other marking, for that matter) to a letter. However, the auto-correct feature in some computer programs will change naive to naïve, as my browser has done in this post.

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Basically the answer is that naïve is sometimes spelled with the diaresis because it is derived from French which spells it that way. It is actually very uncommon for native English speakers to spell it with the diaresis, largely because, as you've noticed, the diaresis is not normally a part of the English language. English keyboards don't even contain a modifier to add a diaresis (or a tilde, accent, or any other marking, for that matter) to a letter. However, the auto-correct feature in some computer programs will change naive to naïve, as my browser has done in this post.