Thank you...

I often start it by stating the facts why I am thankful to him/her. Then, I will tell the person the effects of those to my life like; how it changed something or how much it mean to me. And lastly, I will heartily thank that person.

Saying thank you really depends on what situation you are in or what are you thanking about. Basically construct it in a humble and nice kind of way. But if you really are sincere with thanking someone you don't have to think about it too much, it will just come out of your mouth spontaneously. Do it most often, it's a nice feeling to thank someone who have contributed something in our life even in a minute details. :)

beginning said your word "thank you" must start with a sincere heart, do not expect a reward becuase your word has become its own reward