At one time : একদা; এককালে; একবার;
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Appropriate Prepositions
Appetite for(ক্ষুধা): He has no appetite for food.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Concerned with(জড়িত): She was concerned with such things.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Play at (খেলা): I do not play at cards.
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Idioms
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.