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
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Inquire for (দেখা করতে চাওয়া): He inquires for the manager.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Out of date (সেকেলে): This fashion is out of date.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.