Unobservedly : অগোচরে;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Regret for (দুঃখ করা): We regretted for his failure.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
On the wane (হ্রাসমান): His fame is on the wane now.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.