Articles and quantifiers in English don't need to be a headache
The way I see it, most people overcomplicate a, an, some and any. They memorize tables, draw charts, and still mess it up when they actually try to speak. I got tired of watching people do that and just sat down to sort it out once and for all. Here's how it actually works in practice. a and an are for singular countable nouns when you're talking about one item of something unspecified. Some and any are for plural countable nouns and uncountable nouns. That's the core of it. Everything else is a refinement of that distinction.
a an some and any explained like a normal person
A goes before words that start with a consonant sound. Not letter, sound. So you say "a university" because it starts with a /j/ sound, and "an hour" because the h is silent and it starts with an /a/ sound. This trips people up constantly. I've seen native speakers from non-English speaking countries lose points on tests over this exact thing. It's not about spelling. It's about pronunciation. Some is what you use when you're offering something or asking for something and you expect a yes. "Would you like some water?" sounds more natural than "Would you like any water?" to my ear at least. The second one isn't wrong. It's just slightly more neutral, like you genuinely don't care what the answer is. But in casual speech, some wins most of the time in positive contexts.
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Any is your go-to for negatives and questions. "I don't have any money." "Do you have any pencils?" These are the bread and butter uses. They work 95% of the time without thinking. The real edge case that got me once was when I was editing a document for a client who had written something like "I need some advice on this matter." Now, advice is uncountable. You can't say "some advices." But some people instinctively treat certain words as if they should be plural because they think of multiple instances. I corrected it to "some advice" and explained the rule, but the client pushed back saying they'd heard "advices" in business meetings. They hadn't. But that's the kind of false confidence people get from hearing wrong usage repeated often enough. The workaround I used was just showing them the dictionary entry with the /nad/ pronunciation marked as uncountable and pointing out that every major style guide agrees on this one. Takes five seconds to settle it when you have the reference.
Another thing most guides don't emphasize enough: any can be used in positive sentences too, but it changes meaning completely. "Any student can solve this" means every single student, not just some of them. That's a different grammatical function. It's called a free-choice any, and it's worth knowing because you'll encounter it in academic writing and formal contexts. If you only learned any = questions and negatives, you'll be confused the first time you read it used this way. There's also the zero article, which is where things get messy. "I went to school" vs "I went to the school." One means you were a student going to learn. The other means you went to the building for some other reason. This is where a, an, some and any stop being the whole story. You need to understand when to use nothing at all. But that's a separate problem and probably deserves its own page.
Don't bother with downloadable cheat sheets. They tend to be either too vague or too cluttered. The best approach is to memorize the basic rule, notice the exceptions as you encounter them in real reading, and build a mental model that handles the common cases automatically. You'll get there faster than you think.