Mental abstraction : চটকা;
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Appropriate Prepositions
Abhorrence of (ঘৃণা): Everyone should have abhorrence of a par.
Adept in (দক্ষ): He is adept in playing football.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.