Hard and fast rules : ধরাবাঁধা নিয়মকানুন;
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Attentive to(মনোযোগী): He is attentive to his business.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Die of (রোগে মরা): Many people died of cholera.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Bad names (গালমন্দ—n) He called the man bad names.
In vogue (চালু): This custom is not in vogue at present.
Run short (কমতি পড়া) —I ran short of money.
Up to (পর্যন্ত) - I have done the exercises up to page 40.