Flog a dead horse : বৃথা চেষ্টা করা;
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Appropriate Prepositions
Zeal for (উৎসাহ): Forhad has great zeal for cricket.
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Careless of(অসতর্ক): Do not be careless of your health.
Convinced of (আশ্বস্ত): You are convinced of his product.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.