By mistake : ভুলবশত; ভ্রমক্রমে; ভ্রান্তিবশত;
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Appropriate Prepositions
Abhorrence of (ঘৃণা): Everyone should have abhorrence of a par.
Argue against (বিপক্ষে বলা): She argued against the bill.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Object to (আপত্তি করা): He objected to my proposal.
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Idioms
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.