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I use Google to translate phrases in my iPad app; when I have a phrase that starts with a capital letter in English, Google translates the phrase but starts with a lower-case letter. Is this linguistically correct?

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up vote 3 down vote accepted

Every sentence in Spanish must start with a capital letter. See clause 3.1 here.

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There is a tiny exception: when a sentence starts with a symbol in smallcase (such as pH, kg, etc). Nevertheless, to avoid this case, the recommendation is never to start a sentence with one of these symbols, which is usually quite easy to do (e.g.: m es el símbolo del metro would become El símbolo del metro es m). – Gorpik Apr 21 '14 at 11:12
@Gorpik: Very interesting. Do you have a reference for that? – CesarGon Apr 21 '14 at 14:12
I've read the símbolo article of the DPD, but there is nothing there. It just mentions that symbols are as they are (i.e. they never change their combination of capitals and smallcase letters). I'd swear I've read the recommendation in some RAE document, but I cannot find it. Not good enough for an answer, so I left it as just a comment to your correct answer. – Gorpik Apr 21 '14 at 14:16
@Gorpik: I have the same feeling. I sort of recall reading about it somewhere, but I can't put my finger on it. Anyway, thank you! – CesarGon Apr 21 '14 at 14:18

Grammar says so, Spanish sentences must start with a capital letter.

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