At one time : একদা; এককালে; একবার;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Appointment with (সাক্ষাতের সময়): He has an appointment with the minister at 10:00 am.
Concerned with(জড়িত): She was concerned with such things.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.