Is correction needed to learn to speak a language well?

When discussing language learning and input-based approaches like Automatic Language Growth (ALG), I encounter many people who insist that you need to have someone correcting you in order to learn to speak a language properly, especially if it’s a “difficult” one like Thai or Mandarin that has tones and other features that don’t exist in English.

They are often quite adamant about the need for instruction and constant correction and can’t seem to conceive of an adult learner being able to pronounce a language correctly without study and practice.

In my experience, it is possible even as an adult to learn to speak a language pretty clearly, to say the least, without any explicit instruction or practice.

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