As firm as a rock : অটল; অচল; অনড়;
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Appropriate Prepositions
Attain to (লাভ করা): He will not attain to his objective so soon.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Convert to(দীক্ষিত): Tom is converted to another religion.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Without fail (অবশ্যই) - You must attend the meeting without fail.