First hand knowledge : মৌল জ্ঞন;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.