Backward classes : অনুন্নত সম্প্রদায;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Care of(যত্ন নেওয়া): You should take care of your health.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
Lame excuse (বাজে ওজর): The lame excuse will not do.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.