Authenticates : বিশুদ্ধতা প্রমাণ করা;
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Appropriate Prepositions
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Burst into(কান্নায় ভেঙ্গে পড়া): He burst into tears.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.