Ungrateful : অকৃতজ্ঞ;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.