Lack of concentration : তারল্য;
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Appropriate Prepositions
Angry with(কারো সাথে ক্রুদ্ধ হওয়া): The teacher was very angry with the students.
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Call in(ডাকিয়া আনা): They called in a doctor.
Detrimental to (অপকারী): Smoking is detrimental to health.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.