Extemporaneous : অনিয়মিত; তত্ক্ষণিক; পূর্বপ্রস্তুতিহীন; অচিন্তিতপূর্ব; আকস্মিক; আপতিক; দৈবাৎ;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Set something right (ঠিক করা)— He will set the machine right.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.