Ungratefulness : কৃতঘ্নতা;
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Appropriate Prepositions
Adapt for (উপযোগী করে নেওয়া): This book has been adapted for the children.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Appetite for(ক্ষুধা): He has no appetite for food.
Regard for (সম্মান): Good boys have great regard for their teachers.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.