Cornerstone : ভিত্তি; ভিত্তি-প্রস্তর;
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Appropriate Prepositions
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Run short (কমতি পড়া) —I ran short of money.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.