Problematical : অনিশ্চিত; সন্দেহযুক্ত; সমস্যামূলক; সমস্যাপূর্ণ; বিতর্কমূলক;
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Appropriate Prepositions
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Heir to (উত্তরাধিকার পাওয়া): He is an heir to a vast property.
Indulge in (আসক্ত): You should not indulge in social media.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
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Idioms
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.