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
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Caution against(সাবধান): Take all cautions against the danger.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
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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.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Safe and sound (নিরাপদে)— He reached home safe and sound.