Trial and error method : শুদ্ধাশুদ্ধি প্রণালী;
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Appropriate Prepositions
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Care of(যত্ন নেওয়া): You should take care of your health.
Catch at(ধরা): A drowning man catches at a straw.
Charge with(অভিযুক্ত করা): He is charged with killing.
Informed of (অবহিত): I was not informed of your misfortune.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.