Demonstrator : যব্যবহার প্রদর্শক, প্রতি পাদক
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Argue against (বিপক্ষে বলা): She argued against the bill.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Detrimental to (অপকারী): Smoking is detrimental to health.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Pass away (মারা যাওয়া)— He passed away last night.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.