Is this ok?Don’t be afraid of making mistake while learning a language. When you make mistakes and know what your weakness is, you will have a rapid improvement.

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Don’t be afraid of making mistakes while learning a language. When you make mistakes and know what your weaknesses are, you will make rapid improvement.

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Suggested version: Don’t be afraid of making mistakes while learning a language. When you make mistakes and find out (or "discover") what your weaknesses are, you will have rapid improvement (or "improve rapidly").

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