It is a solved problem, Assimil or Michel Thomas (in person) have been making people conversational within a week of dedicated study. Plenty of language learners have reached C2 in 6+ languages including me. But it's not fun and certainly not appable (and these apps never offer anything beyond flashcards)"appable".
Human language is imprecise and allows unclear and logically contradictory things, besides not being checkable. That's literally why we have formal languages, programming languages and things like COBOL failed: https://alexalejandre.com/languages/end-of-programming-langs...
Let X=X.
You know, it could be you.
It's a sky-blue sky.
Satellites are out tonight.
Language is a virus! (mmm)
Language is a virus!
Aaah-ooh, ah-ahh-ooh
Aaah-ooh, ah-ahh-ooh
Why so?
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