Variability : পরিবর্তনশীলতা; অনিত্যতা; পরিবর্তনীয়তা;
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Concerned with(জড়িত): She was concerned with such things.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Remedy for (প্রতিকার): There is no remedy for cancer.
Repentance for (অনুতাপ): He has repentance for the past.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.