On Fri, Feb 03, 2023 at 10:11:19AM +0200, Tudor Ambarus wrote: > The deciding factor for when a/an should be used is the sound > that begins the word which follows these indefinite articles, > rather than the letter which does. Use "an SPI". (SPI begins > with the consonant letter S, but the S is pronounced with its > letter name, "es.") No, this is wrong. English is really not regular enough to do anything on the basis of rules and the more commonly used thing is that you use an when the word starts with a vowel (frankly I've never heard the sound thing before). As a native speaker "an SPI" sounds wrong to me.
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