If you make many mistakes when speaking the language, it just means that you are not there yet. You may know many words and expressions superficially, but you still need to finish acquiring them well. You may know enough words for the situation in which you are trying to use the language, but you may not have acquired some of the grammar that is naturally acquired at later stages of the process yet. If you could already speak a related language, you may be able to “wing it” and produce sentences, but you’ll be relying on your first language for a lot of the vocabulary and grammar, so your sentences will be riddled with errors. Again, there is nothing really to “fix”. You just need to continue acquiring the language by getting more input. We also answer this question in our video FAQ (with English subtitles):
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