0Tough question. You'll have to read a lot and learn patterns of usage. There are no straight rules.
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01cite10Gori12cite10how can I know when to make these nouns countable and when to make these nouns uncountable? 12blockquote10You don't actually 'make them countable' and 'make them uncountable'. There's something wrong about the way you're explaining these concepts to yourself.02br