Before I have come to know you as my teacher, I often thought that school life is boring. But when you came, you have certainly made school interesting, something which I always look forward to every day. Thank you for being a great teacher, happy birthday!
You may also like
My career has been a challenging and enjoyable ride because you were there to guide me all throughout. Wonderful birthday!
It is always you who lead is into the right direction of success, now it is time for us to lead you on the right direction to the pub. Best birthday!
I wish you all the success and happiness that you deserve, plus a raise on my pay if you are feeling particularly generous today. Happy birthday!