Profi ciency : দক্ষতা; কুশলতা; বু্যত্পত্তি;
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profi ciency  proficiencies  proficiency  See Words Also In
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Desire for (কামনা): He has no desire for fame.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.