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
Abide in(বাস করা): I abide in Dhaka with my family.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
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Idioms
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.