Geometrical progression : গুণোত্তর শ্রেণী;
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Appropriate Prepositions
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Care for(গ্রাহ্য করা): I do not care for you.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Play on (বাজানো): They play on the piano.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.