Observer : পর্যবেক্ষক, দর্শক, মন্তব্যকারক
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Appropriate Prepositions
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Plead for (ওকালতি করা): He pleads for justice.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Up to (পর্যন্ত) - I have done the exercises up to page 40.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.