First hand : সরাসরি; হাতে-কলমে;
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Appropriate Prepositions
Call in(ডাকিয়া আনা): They called in a doctor.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Convert to(দীক্ষিত): Tom is converted to another religion.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.