At one time : একদা; এককালে; একবার;
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Appropriate Prepositions
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Detrimental to (অপকারী): Smoking is detrimental to health.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Repent of (অনুতাপ করা): I repented of my past.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
Round the clock (সমস্ত দিন): He is working round the clock.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.