Proficient : দক্ষ, বু্যৎপন্ন;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Fed up with (বিরক্ত): He is fed up with waiting for her.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.