Authenticating : বিশুদ্ধতা প্রমাণ করা;
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Lump sum (এক কালীন) — He gave us lump sum money.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Take into account (বিবেচনা করা): Your activities should be taken into account.