Open-and-shut : সম্ভবত; স্পষ্টত;
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Appropriate Prepositions
Adapt for (উপযোগী করে নেওয়া): This book has been adapted for the children.
Certain of(নিশ্চিত): Jamal is certain of his success.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.