System of forces : বলশ্রেণি;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.
Well off (স্বচ্ছল) - Jim and Della were not well off.