Thanklessness : কৃতঘ্নতা;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Convinced of (আশ্বস্ত): You are convinced of his product.
Count upon(নির্ভর করা): He always counts upon your help for this work.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Set something right (ঠিক করা)— He will set the machine right.