Inefficient : অনিপূণ; অযোগ্য; অপটু
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Appropriate Prepositions
Adapt for (উপযোগী করে নেওয়া): This book has been adapted for the children.
Argue against (বিপক্ষে বলা): She argued against the bill.
Play at (খেলা): I do not play at cards.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.