Lack of concentration : তারল্য;
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Appropriate Prepositions
Attain to (লাভ করা): He will not attain to his objective so soon.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Convinced of (আশ্বস্ত): You are convinced of his product.
Curse for (অভিশাপ দেয়া): If he ever mistreats my parents, I will certainly curse him for it.
Look after (দেখাশুনা): He looks after me.
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Idioms
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.