For aught i know : আমি যতটুকু জানি; আমি যতদূর জানি;
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Appropriate Prepositions
Call on(কারও সাথে দেখা করা): I called on him in his office.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Infested with (অতিষ্ঠ): The room is infested with rats.
Play on (বাজানো): They play on the piano.
Satisfied with (সন্তুষ্ট): The authoress was highly satisfied with Jerry.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Well off (স্বচ্ছল) - Jim and Della were not well off.