Categorical imperative : নিঃশর্ত নৈতিক কর্তব্য;
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Appropriate Prepositions
Apart from(ছাড়া, ব্যতীত, দূরে): They pave apart from each other.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.