Corner-stone : প্রধান ভিত্তি প্রস্তর;
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.