けどBut, However

Both が (or だが/ですが after a noun or な-adjective) and けど・だけど express contrast or transition, similar to 'but' in English (e.g., '見た目は美味しそうだけど、味がない' = 'It looks tasty, but has no flavor'). The difference is that が is more formal or written-style, while けど is more colloquial. Both can also be used at the end of a sentence to suggest an implied contrast, even if not explicitly stated.

Both けど・だけど (and the polite ですけど), as well as だが・ですが, express contrast, similar to 'but,' or sometimes just indicate a transition (like 'and'). The key difference is that だが is more formal and used in written contexts, while けど is more casual. Both can be used at the end of a sentence to imply something is left unsaid.

けど and けれども are essentially the same expression, with けど being a shortened form of けれども. Both express contrast, like 'but' in English, or soften a statement. The difference is in their formality: けど is casual and colloquial, while けれども is more formal and is most often used in writing or formal speech.

Both introduce contrast, like the English 'but'. けど・だけど are common in speech, as in 難しいけど面白い ('It's difficult, but interesting.'). Adding ～ん to this pattern adds an explanatory nuance, often used to imply a request or hesitation, e.g. 難しいんですけど 'It's difficult, but...(do you want me to do it anyway?, etc.)'.

Both ところが and けど・だけど express contrast or contradiction. The key difference is that ところが is used at the beginning of a sentence to emphasize a contrast between the expected result and reality, and is more formal. In contrast, けど・だけど are used after a phrase or at the end of a sentence to express simple contrast or contradiction.