Fundamental principle : মূলসূত্র; মূল নীতি; মূলতত্ত্ব;
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Conceal from(লুকানো) Do not conceal anything from me.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
In vogue (চালু): This custom is not in vogue at present.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.