Trial and error method : শুদ্ধাশুদ্ধি প্রণালী;
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Appropriate Prepositions
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Penalty for, with (দণ্ড, জরিমানা): She has paid the penalty for the misuse of power with two years in prison.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Three score (ষাট): He is happy as his brother got three score.