Confidential letter : গোপনীয় পত্র;
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Appropriate Prepositions
Attacked with(আক্রান্ত): He is attacked with …
Care for(গ্রাহ্য করা): I do not care for you.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Relation with (সম্পর্ক): I have no relation with the culprit.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.