Geometrical progression : গুণোত্তর শ্রেণী;
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Appropriate Prepositions
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Plead for (ওকালতি করা): He pleads for justice.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.