Fundamental principle : মূলসূত্র; মূল নীতি; মূলতত্ত্ব;
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Attacked with(আক্রান্ত): He is attacked with …
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.