1)
You should come.
You think so?
Yes. Do you have anything/something better to do?
I guess not.
2)
What are you doing here? Don't you have anything/something better to do?
What is the difference? Which one should I use in the two examples above?
In this context, I see no difference in meaning. You can use either.
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In this context, I see no difference in meaning.
You can use either.
anonymousDo/Don't you have anything/something better to do?
anything does not presume the existence of the thing in question, the existence of a particular thing. Thus, it invites a negative answer. It's "general" in the sense that it refers to "whatever thing it might be".
something presumes the existence of a thing (or things) that m