Customary law : প্রথাসিদ্ধ আইন;
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Appropriate Prepositions
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Look for (খোঁজা): I was looking for the lost phone.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.