Backward classes : অনুন্নত সম্প্রদায;
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Appropriate Prepositions
Catch at(ধরা): A drowning man catches at a straw.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Informed of (অবহিত): I was not informed of your misfortune.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Take into account (বিবেচনা করা): Your activities should be taken into account.