Of unsound mind : অপ্রকৃতিস্থ; বিকৃতমস্তিষ্ক; পাগল;
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Appropriate Prepositions
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Set out (যাত্রা করা)— I will set out in time.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.