Fundamental principle : মূলসূত্র; মূল নীতি; মূলতত্ত্ব;
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Appropriate Prepositions
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Look for (খোঁজা): I was looking for the lost phone.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Man of straw (অপদার্থ): We do not care for a man of straw like you.