For a long time : দীর্ঘসময়ের মধ্যে; বহুকাল ধরিয়া; কতকাল; কতদিন;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Cause of(কারণ): Industry is the cause of your success.
Die of (রোগে মরা): Many people died of cholera.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.