Unnecessarily : অনাবশ্যকভাবে, অকারণে, খামাখা;
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Appropriate Prepositions
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
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Idioms
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Slow coach (অলস): You cannot expect much from a slow coach.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.