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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Hard-Working – For this word:  the “H” is pronounced audibly;  the “a” is pronounced like the short letter “o”;  the final “d” of the first word is (often) stopped – then:  the “o” disappears;  and the “-ing” suffix is pronounced like in the word “Sing” or “Ring” (this is the standard pronunciation of this suffix in The Common Tongue).

– /hahr[d]-W’R-king/ – /hɑɹ[d]-ˈwɚ.kɪŋ/ – Notice also that the stress is on the first syllable of the second word –

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Learn More About The Word “Hard-Working” On Wiktionary

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