Backward class : অনুন্নত সম্প্রদায়;
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Call in(ডাকিয়া আনা): They called in a doctor.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Follow the footsteps of (পায়ে পায়ে অনুসরণ করা): People always follow the footsteps of some great man.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.