In the picture : যথাযথরূপে অবগত বা বিদিত;
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Certain of(নিশ্চিত): Jamal is certain of his success.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Null and void (বাতিল): The deed has been null and void now.
Of course (অবশ্যই): Of course, you know what that meant.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.