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
Attain to (লাভ করা): He will not attain to his objective so soon.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
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Idioms
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In no time (শীঘ্র): He will finish the work in no time.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.