Which ‘but’ is a preposition?

✅ কেন সঠিক: ‘What can we do but sit and wait?’ — এখানে ‘but’ মানে ‘except’ (ছাড়া); এটি noun-equivalent (sit and wait)-এর আগে বসে preposition-এর কাজ করছে।

❌ অন্য অপশন: ‘It is but right’ — ‘but’ = only, তাই adverb; ‘We tried hard, but did not succeed’ — দুটি clause যুক্ত, তাই conjunction; ‘There is no one but likes him’ — ‘but’ = who … not, তাই relative pronoun।

💡 মনে রাখুন: ‘but’-এর ভূমিকা: except = preposition; only = adverb; কিন্তু = conjunction; who/which … not = relative pronoun।

📌 জেনে রাখুন: আরেকটি উদাহরণ: All but John were present — এখানেও ‘but’ preposition (except)।