Unfortunately : দুর্ভাগ্যবশত; দুর্ভাগ্যক্রমে;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Ascend from (উপরে ওঠা): Rahim watched the mist ascending from the valley.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Noted for (বিখ্যাত): She is noted for dancing.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
On the wane (হ্রাসমান): His fame is on the wane now.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.