Once in a blue moon : নমাসে ছমাসে;
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Appropriate Prepositions
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.