At fault : কিংকর্তব্যবিমূঢ়;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Certain of(নিশ্চিত): Jamal is certain of his success.
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Idioms
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?