Which “but” is a preposition?

What can we do but sit and wait? এই বাক্যে but একটি preposition, কারণ এটি except (ছাড়া) অর্থে ব্যবহৃত হয়েছে।

But (Preposition): Used as except; apart from; other than.
- In Dhaka, we were never anything but poor.
- I trusted no one but him.

অন্য অপশনগুলো:

• It is but right... - but এখানে right-কে modify করছে।
• We tried hard, but did not succeed - but একটি conjunction, দুটি clause যুক্ত করছে।
• There is no one but likes him - but এখানে pronoun-এর কাজ করছে।