Retrospective effect : ভূতাপেক্ষ কার্যকরতা;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.