Effective force : ত্বরণ-বল;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.