Active principle : সত্ত্ব;
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Appropriate Prepositions
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Fair and square (সৎ): The learned persons should be fair and square.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.