I think that congratulations to some people is a good thing because they will know that we are happy with them, and they will feel proud of yourself like I do when I receive congratulations.
I think congratulations on some great things. Because they will know that I am happy with them. And they do not feel proud of myself as I once was congratulated.
I thought congratulations to someone is a good thing. Because they know we are happy with them. And they can feel proud of myself as I once received the congratulations!