To be sure : নিশ্চয়ই; আমি স্বীকার করি; তাই নাকি;
Related Words
to absorb  to be sure  to obscure  See Words Also In
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Appropriate Prepositions
Compete with(প্রতিযোগিতা করা): He does not pke to compete with
Consist of(গঠিত হওয়া): The committee consists of ten members.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
Regret for (দুঃখ করা): We regretted for his failure.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.