在英语中，告别老师的常见说法包括：
"Goodbye, teacher" 或 "Goodbye, Mr./Mrs./Ms. [老师的姓名]"。这是最常用的告别老师的说法。
"Take care, teacher" 或 "Take care, Mr./Mrs./Ms. [老师的姓名]"。这句话的意思是"照顾好自己，老师"。
"Thank you for everything, teacher" 或 "Thank you for everything, Mr./Mrs./Ms. [老师的姓名]"。这句话的意思是"感谢您所做的一切，老师"。
"I'll miss you, teacher" 或 "I'll miss you, Mr./Mrs./Ms. [老师的姓名]"。这句话的意思是"我会想念您，老师"。
"It was a pleasure studying with you, teacher" 或 "It was a pleasure studying with you, Mr./Mrs./Ms. [老师的姓名]"。这句话的意思是"和您一起学习是一种乐趣，老师"。
例句：
"Goodbye, teacher. I'll miss you."（"再见，老师。我会想念你。"）
"Take care, Mrs. Smith. Thank you for everything."（"照顾好自己，史密斯太太。感谢您所做的一切。"）
"It was a pleasure studying with you, Mr. Jones. Goodbye."（"和你一起学习是一种乐趣，琼斯先生。再见。"）