Cultured pearl : শুক্তির দেহের ভেতরে ঢুকিয়ে-দেওয়া পদার্থকে কেন্দ্র যে মুক্তো তৈরি হয়;
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Appropriate Prepositions
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Look at (তাকানো): Students look at the blackboard.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.