Helpful : সাহায্যকারী, উপকারী
Related Words
helpful  helpfulness  helpless  See Words Also In
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Argue against (বিপক্ষে বলা): She argued against the bill.
Call in(ডাকিয়া আনা): They called in a doctor.
Detrimental to (অপকারী): Smoking is detrimental to health.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.