V a l i d i t y : বৈধতা; দৃঢ়তা; ন্যায্যতা; যথাযথতা; সঠিকতা; খুঁতশূন্যতা; অকাট্যতা;
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Appropriate Prepositions
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Certain of(নিশ্চিত): Jamal is certain of his success.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.