今天是我的好朋友的生日，我想用英语给他写一封生日祝福信。

Dear friend,

Today is your special day, and I want to take a moment to wish you a very happy birthday! I am so grateful to have you in my life and to call you my friend. You have been a constant source of support, laughter, and inspiration, and I cannot thank you enough for all that you do.

On this day, I hope that you are surrounded by love and laughter, and that you feel all of the warmth and joy that you deserve. May your day be filled with good food, great company, and plenty of cake! And may the year ahead be filled with even more wonderful moments, memorable experiences, and all of the things that make life worth living.

Thank you for being such an amazing friend, and for always being there for me whenever I need you. I hope that this birthday is just the beginning of a new year filled with happiness, health, and success.

Happy birthday, my dear friend! Wishing you all the best today and always.

With love and warmest wishes,

[Your name]