Through proper channel : যথাযথ প্রণালী-মাধ্যমে;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Informed of (অবহিত): I was not informed of your misfortune.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Set something right (ঠিক করা)— He will set the machine right.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.