For a long time : দীর্ঘসময়ের মধ্যে; বহুকাল ধরিয়া; কতকাল; কতদিন;
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Angry with(কারো সাথে ক্রুদ্ধ হওয়া): The teacher was very angry with the students.
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.