Letter of regret : অসম্মতিপত্র;
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Appropriate Prepositions
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Zeal for (উৎসাহ): Forhad has great zeal for cricket.
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Argue against (বিপক্ষে বলা): She argued against the bill.
Indulge in (আসক্ত): You should not indulge in social media.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.