以下是一些英文社交場合的常用句子：
1. Nice to meet you.
2. How are you?
3. Good morning/afternoon/evening/night.
4. I'm sorry to keep you waiting.
5. Thank you for coming.
6. Mind if I join you?
7. Could you repeat that?
8. Nice to talk with you.
9. I'm feeling comfortable/good/pleasant here.
10. What do you think of...?
社交場合需要多練習和運用不同的語言表達，而且需要根據具體語境來表達，只要多使用多練習就可以逐步提升英文表達能力。