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by bayesian_horse 2368 days ago
Yes, formal grammar instruction is optional. But it does accelerate things.

I mean, it may depend on your goals. If you are focused on communicating, and don't actually intend on using the language efficiently and competently, then maybe formal grammar is a waste of time.

Otherwise you need to have this information. You have a choice to get it in a systematic way or to decipher it on your own.