Quadrangle : চতুর্ভুজ সমতল ক্ষেত্র;
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Appropriate Prepositions
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Concerned with(জড়িত): She was concerned with such things.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.