Rule of thumb : চলতি রীতি; চলতি পদ্ধতি;
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Appropriate Prepositions
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Cruise to (জয় লাভ করা): The Bangladesh team cruised to their fifth successive win this afternoon.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.