Which letter is very hard for non-native speakers to pronounce in English (apart from 'w', 'z' and 'y')? Why is that so? - Quora
Daily English Learning - Words that native speakers use compare to words non natives use #DailyEnglishLearning | Facebook
Texas Global English Language Center - The English language is great to know but can be difficult to master. Certain words and phrases (idioms) can be confusing to non-native speakers, but don't
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