"for" or "to"

Which of these sentences is correct?
It is important for me… OR It is important to me…
It is interesting for me… OR It is interesting to me…
It was scarey for you… OR It was scarey to you…

Thanks a lot.

“important for (someone)” and “important to (someone)” are both possible. Depending on the rest of the context, the former may be more focused on objective/external importance and the latter more focused on the person’s own interests/desires.

With the “interesting” examples you could again say that the version with “to” may be more focused on the individual’s feelings, but there seems less difference here.

“scary for (someone)” feels more natural to me than “scary to (someone)”, but you may see both. The usual spelling is “scary”.

thank you so much