On the ground of : কারণে; অজুহাতে; ছুতোয়;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Care of(যত্ন নেওয়া): You should take care of your health.
Free from (মুক্ত): He is now free from danger.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Out of order (বিকল): The elevator was out of order.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.