External angle : বহিঃস্থ কোণ;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Aware of(অবগত): I am not aware of his dishonesty.
Care for(গ্রাহ্য করা): I do not care for you.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.