Fundamental principle : মূলসূত্র; মূল নীতি; মূলতত্ত্ব;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.