This is bad for / to you.
This is important for / to you.
Which one is correct or is there a meaning difference between them?
Thank you so much as usual in advance.
This is bad for you. Yes, natural. This is bad to you.
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This is bad for you.
Yes, natural.
This is bad to you.
Not really used. It may refer to a thing (as a person would require 'he' or 'she' rather than 'this') and would potentially mean 'it' was unkind and horrible to somebody. It's hard to make it work as a sentence.
This is important for you.
Yes, makes sense. It suggests that the thing is going to be important