Once in a blue moon : নমাসে ছমাসে;
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Appropriate Prepositions
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Pass away (মারা যাওয়া)— He passed away last night.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.