Hard and fast rules : ধরাবাঁধা নিয়মকানুন;
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Appropriate Prepositions
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Attacked with(আক্রান্ত): He is attacked with …
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Without fail (অবশ্যই) - You must attend the meeting without fail.