At what time : কখন;
Related Words
at a time  at home  at that time  at what time  ata time  See Words Also In
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Conceal from(লুকানো) Do not conceal anything from me.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.