Unnecessarily : অনাবশ্যকভাবে, অকারণে, খামাখা;
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Appropriate Prepositions
Bad at (অদক্ষ): He is not bad at English.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
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Idioms
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.
To meet trouble half-way (পুরোপুরি মোকাবেলার আগেই হাল ছেড়ে দেয়া): He met trouble half way after getting the instructions.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.