On principle : নীতিগতভাবে;
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Appropriate Prepositions
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Dwell in (বাস করা): He dwells in a tall apartment.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.