によって Aaron Jauregui 4年前.
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These type of errors are very common for beginners but even advanced students may still struggle on this. This might be seen as a positive challenge, whereas the professor has the opportunity to correct them on time, so that the learners don't have to deal with them in their communication forever.
It's very common to see these types of mistakes in pronunciation, but honestly I find English pronunciation very easy, compared to French or German. In spite of that, I consider myself to be ultra careful when correcting pronunciation and emphasizing in accent reduction simply because strong accents are just unprofessional.