Fundamental principle : মূলসূত্র; মূল নীতি; মূলতত্ত্ব;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Look after (দেখাশুনা): He looks after me.
Senior to (বয়সে বড়): He is senior to me by two years.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
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.
Set something right (ঠিক করা)— He will set the machine right.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.