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Which one is correct? "a specific situation" or "an specific situation"? I know "an" normally goes with words starting with a vowel but in this case... Specific or specifical? Cynic or cynical? Clinic or clinical? Medic or medical? Juridic or juridical? etc. Specifical is not used. Cynic is a noun, while cynical is its adjectival form. Same thing โฆ as at is quite common in this context to mean at a specific time/date. "As of" to me means since. "As of" only rarely means "since" in AE, and it still sounds awkward and confusing to me, so I โฆ
Sometimes, what's "specific" simply refers to the specific "picture" of "something" that we have in our minds. In other words, we all know what a "rainbow" looks like, and that makes "rainbow" โฆ Therefore, "Co." sometimes occurs with "Ltd." and sometimes it does not. In referring to a specific company, you should be guided in the use of these abbreviations by the organization โฆ I'm not surprised it's been driving you crazy! For a specific date, as in your first two examples, we use 'on'. For a less specific time reference, we use 'in'. You may think of it arising from โฆ
