First hand knowledge : মৌল জ্ঞন;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.