Profi ciency : দক্ষতা; কুশলতা; বু্যত্পত্তি;
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profi ciency  proficiencies  proficiency  See Words Also In
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Attention to(মনোযোগ): He has no attention to his studies.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Take into account (বিবেচনা করা): Your activities should be taken into account.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.