Lack of concentration : তারল্য;
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Appropriate Prepositions
Attention to(মনোযোগ): He has no attention to his studies.
Conscious of(সচেতন): I am conscious of my deficiencies.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?