Proficient : দক্ষ, বু্যৎপন্ন;
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Appropriate Prepositions
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
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.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.