Categorical imperative : নিঃশর্ত নৈতিক কর্তব্য;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Sick of (ক্লান্ত): He is sick of this idle life.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Hush money (ঘুষ): He offered a hush money to disclose the file.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.