At one time : একদা; এককালে; একবার;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Careful of (সতর্ক): He is very careful of his fault.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.