Indispensable : অপরিহার্য, অত্যাবশ্যক
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Appropriate Prepositions
Informed of (অবহিত): I was not informed of your misfortune.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Render into (অনুবাদ করা): Render the passage into Bengap.
Run into (জড়িয়ে পড়া): He had run into debt.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.