Cornerstone : ভিত্তি; ভিত্তি-প্রস্তর;
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Attain to (লাভ করা): He will not attain to his objective so soon.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Die of, for, from (মারা যাওয়া): He died of cholera. He died for his country. He died from an injury.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.