It depends on whether you can be understood. Otherwise, there are other situational factors. How important is it that the person you are speaking to understands what you are saying? How do you present yourself apart from your speech. People are different, and it's hard to generalise.
How do you react to foreigners who have trouble with your language?
Do native speakers really care about foreigners' accent or grammar when talking ?
Furthermore, how about the tolerance of the mistakes?
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