Unchangeability : অপরিবর্তনীয়তা;
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Appropriate Prepositions
Add to (বৃদ্ধি করা, যোগ করা): The doll-dance in the exhibition added to our pleasure.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Look after (দেখাশুনা): He looks after me.
Quick at (চটপটে): A cashier must be quick at figures.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Three score (ষাট): He is happy as his brother got three score.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.