Usefulness : প্রয়োজনীয়তা; কার্যকারিতা;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.