老板发放年终奖是对员工辛勤劳动的肯定和回报，让人倍感温暖和感激。为了表达我们的感谢之情，下面提供了一些英文句子，可以在回复邮件或者口头表达中使用。

首先，我们可以用简单的语言来表达感谢之意，如：

- Thank you so much for the year-end bonus. It is greatly appreciated.

- I just wanted to express my sincere gratitude for the bonus. Thank you!

- Your generosity with the year-end bonus is truly appreciated. Thank you!

如果想要更加表达感激和敬意，可以使用更加正式和地道的表达方式，如：

- I am deeply grateful for the year-end bonus, which is a testament to your appreciation and recognition of our hard work.

- Your decision to provide us with a year-end bonus not only shows your generosity, but also motivates us to work even harder in the coming year. Thank you!

- I want to express my heartfelt thanks for the year-end bonus, which is a true reflection of your leadership and commitment to our team's success.

当然，除了简单地表达感谢之外，我们也可以用具体的例子或者描述来展示我们的感激之情，如：

- The year-end bonus will allow me to pay off some bills and invest in my future. Thank you for your thoughtfulness and support.

- I am truly grateful for the year-end bonus, especially during these difficult times. Your generosity has made a huge difference in my life and I will never forget it.

- Your decision to provide us with a year-end bonus shows that you truly care about our well-being and success. Thank you for being such an amazing boss and leader.

总之，在回复老板发放年终奖的时候，我们可以用简单明了的语言来表达感谢之情，也可以用更加正式和地道的表达方式来展示我们的感激和敬意。无论使用哪种方式，都要真诚地表达自己的感受，让老板感受到自己的真诚和诚恳。