System of forces : বলশ্রেণি;
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Free from (মুক্ত): He is now free from danger.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Solution to (সমাধান): None can solution to every problem.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
In vogue (চালু): This custom is not in vogue at present.
Pass away (মারা যাওয়া)— He passed away last night.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.