Also, I did spoiled my english pronounciation too when i started talking with NATIVES. They have made my english look miserable. So don't bother yourself & them by speaking english with them so oftenly.
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There is a wise saying that IF A PERSON WANTS TO GET PERFECT IN ANY THING/WORK, IT MUST COMPETE/learn WITH THE COMPETITOR STRONGER/BETTER THAN ITSELF
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I think u got my point!!!!!!!!1