Question

@.

1や5のbutは前置詞？で4は接続詞ですか？

2
1. You can choose one, but not both.
2. The shortest way isn't always the best one.
3. You had better not come near me. I have a bad
cold.
4. Winning the game is possible,but it won't be easy.
5. She is good at most sports, but not all of them.