Demonstrator : যব্যবহার প্রদর্শক, প্রতি পাদক
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Appropriate Prepositions
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Quick at (চটপটে): A cashier must be quick at figures.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Three score (ষাট): He is happy as his brother got three score.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.