Once upon a time : এককালে; একদা; পূর্বে কোন একসময়ে;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Render into (অনুবাদ করা): Render the passage into Bengap.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.