Depends on what you want to say:
He was good to me so I married him.
That marriage was good for the entire family.
No.Would there be a hint ? I'd say I'm 90% sure I got it. We say that someone is good to us or some thing is good for us?
Do we do good to somebody or for somebody?
"For" usually means that something is done for someone's benefit and brings them something (luck, money, satisfaction, acknowledgement, etc.) "To" normally means direction and indicates that something "goes" from object 1 to object 2. For example:
I bought presents for my mother
I gave a letter to her
In sentence #1 it's obvious that my mother will be happy when she has got her present, whereas in the sentence with "letter" we don't know whether she will be pleased after reading it or vive versa.
I would assume that milan did understand your question. I would also assume that you did not understand that his post was an attempt to make a general, helpful, observation.I would assume you didn't understand the question. I'm not talking about prepositions in general. I specifically meant the context given in my first post.