Letter of regret : অসম্মতিপত্র;
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Appropriate Prepositions
Care for(গ্রাহ্য করা): I do not care for you.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Identical with (একই ধরণের): You are identical with your sister.
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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.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Without fail (অবশ্যই) - You must attend the meeting without fail.