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Should "I" (first person pronoun) always be used in uppercase, or does it depend on situation (uppercase in the first word of a sentence)?

And why are other pronouns not capitalized?

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As to why the word I is capitilized, and not other personal pronouns, first, it is a single letter and i is easy to lose. Additionally there are other guesses. See the NYT article Me, Myself and I – GoDucks Jan 12 at 22:33
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@GoDucks Thanks , useful link – Arman Jan 12 at 22:36
    
This is one of the first things taught in English courses, and I still don't understand why people are so lazy, or keep writing "i", which is very annoying. – nbro Jan 13 at 14:27
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@nbro I wish they would follow that lesson up with "u and U are not English pronouns." I see both of those a lot more often than I see uncapitalized i. – shoover Jan 13 at 17:26
up vote 28 down vote accepted

Yes, in standard written English, we always capitalize I.

From a Wikipedia page,

I (and only this form of the pronoun) is the only pronoun that is always capitalized. The practice became established in the late 15th century, though lowercase 'i' was sometimes found as late as the 17th century.


Additional information (to the question "Why are other pronouns not capitalized?"):

One thing that makes I unique is that I is the only one-letter pronoun. All other pronouns (including me, my, and mine) have two or more letters.

Further reading:

(Special thanks go to GoDucks for the link to the article Me, Myself and I.)

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I am surprised at how closely Why Do We Capitilize I? follows the content of the NYT article (which I posted as a comment to the OP and which I find suitable to include in your answer) down to recent electronic usage of i. – GoDucks Jan 12 at 22:46
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@GoDucks That's quite interesting! According to the dates, the NYT article was published first. They could share the same source or the blog post could be based on the NYT article. In any case, I think it's useful to add the NYT article to the list. Thanks! – Damkerng T. Jan 12 at 23:00
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Let's just say if a student turned in the blog post as a paper and I knew about the NYT post, I would have some questions for that student. I will not say the P word here, but yeah... – GoDucks Jan 12 at 23:06

Yes, I (the pronoun) should always be capitalised.

A lowercase i means the letter "i" or Roman numeral 1. The only time a lower case pronoun I is acceptable is if done for reasons of style, for instance deliberately avoiding the use of all capital letters, such as alice, bob and i (normally Alice, Bob and I). I have read a published book written entirely this way, however, in mainstream writing this is usually frowned upon.

As to why the other pronouns are not capitalised, language doesn't have to have logical rules. In Latin the first letter of a sentence is not capitalised unless it is a proper noun. In German all nouns (not just proper nouns) are capitalised. English is no more or less logical than any other natural language, it's just different. The rules are somewhat arbitrary and sometimes we have evidence as to why it is the way it is and sometimes we don't.

I try to avoid mentioning other people answers, but in this case you already have some excellent links which I won't attempt to duplicate. I will, however, recommend the following entries on Wiktionary:

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