Authenticating : বিশুদ্ধতা প্রমাণ করা;
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Appropriate Prepositions
Convert to(দীক্ষিত): Tom is converted to another religion.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.