Once in a blue moon : নমাসে ছমাসে;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Care for(গ্রাহ্য করা): I do not care for you.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
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Idioms
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
Up to (পর্যন্ত) - I have done the exercises up to page 40.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.