By air mail : বিমান ডাকে;
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Appropriate Prepositions
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Rely on (নির্ভর করা): We should not rely on a lazy man.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
For good (চিরদিনের জন্য): He left the house for good.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.