以下是一些表達感謝的英文佳句：
1. Thank you so much for your help.
2. I really appreciate your assistance.
3. I cannot express how grateful I am.
4. You have been a big help, I can't thank you enough.
5. I am truly grateful for your kindness.
6. Your support and assistance have been invaluable.
7. I cannot wait to return the favor someday.
8. You have no idea how much I mean to me. Thank you.
9. Your generosity and kindness are beyond measure.
10. I am forever in your debt. Thank you again.
請記住，在表達感謝時，真誠是最重要的。