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The At Dev dictionary uses a unique diacritical mark system (e.g., ˈkɒn.tɪ.nənt). Take 10 minutes to learn the pronunciation key at the front of the PDF. This will dramatically improve your spoken English. While I cannot provide direct download links, here
The primary technical hurdle is proper Unicode rendering in PDF. Bengali has complex conjunct characters (যুক্তাক্ষর) like ক্ত, ঙ্গ, দ্ধ. Warning: Avoid random ad-heavy download sites