Unthankfulness : কৃতঘ্নতা;
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Appropriate Prepositions
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
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Idioms
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.