Flog a dead horse : বৃথা চেষ্টা করা;
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Appropriate Prepositions
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Bad at (অদক্ষ): He is not bad at English.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.