毕业之际，向老师表达感谢是非常重要的。以下是一些英语中用来感谢老师的句子，供您参考：

1. "Thank you, teacher! You are the most selfless person I know. Who would have thought that when I was lost, you were there to guide me？"

2. "Of you not being an actor, it attracts our hungry eyes； you are not a singer, but let the knowledge spring tinkling, sing charming songs； you are not a sculptor, but to shape a batch of young people's soul... Teacher ah, how can I forget you!"

3. "Thank you for making learning not a job but a joy. I could have achieved no success without your unselfish dedication."

4. "You have been a qualified teacher and even a better friend. Thank you for all that you have done."

5. "I am not an outstanding student of yours, but you are the most respectable teacher to me in my eyes. On this special day, I extend my heartfelt respects to you!"

6. "We are more thankful than we can express. Your dedication to teaching has made a profound impact on our lives."

7. "Thank you for helping us make something of our lives. You are like a third parent to us all."

8. "With you, my life is wonderful. Thank you, my teacher."

这些句子都表达了学生对老师辛勤付出的感激之情，您可以根据自己的实际情况选择合适的句子来表达您的感谢。