Per pro : দ্বারা; বদলির দ্বারা;
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per pro  perfer  periphery  See Words Also In
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Appropriate Prepositions
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Competent for(যোগ্য): He is not competent for the post.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Without fail (অবশ্যই) - You must attend the meeting without fail.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.