Empirical formula : স্থূল সূত্র;
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Appropriate Prepositions
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Caution against(সাবধান): Take all cautions against the danger.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
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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.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.