Most native speakers will never have analysed the grammatical aspects of this issue. Many probably aren't even consciously aware that it exists. I think most people just know what "sounds right" based on hearing it said over and over.
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pructusFrom intuition?Yes. We know the usage mostly from the intuition we gain from experiencing a lifetime of hearing and speaking English.
pructus to memorize so many phrasal verbs makes it hard and then again, to find out if it's separable or not makes it even more difficult...Yes, but you have an opportunity to live in an English-speaking region and have to use English every day, you catch on pretty quickly without even trying to memorize anything. If you can't do that, one way to approximate