Know-how : ব্যবহারিক জ্ঞান; কারিগরি কৌশল;
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know  know how  know-how  knowhow  known  See Words Also In
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Convinced of (আশ্বস্ত): You are convinced of his product.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Repentance for (অনুতাপ): He has repentance for the past.
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Idioms
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.