System of forces : বলশ্রেণি;
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.