very much appreciated for your opinion.
Sorry I didn't make it clear, in the case of the example, it's linking verb, as you stated. If here "is" means equal, then another problem occurs: how can a attribute, namely beauty, be equal to a substance, namely she? I wonder, an attribute can only be attached to a substance, isn't?
In the case of Hamlet, generally, translator tends to translat the "be" here as live or die into many languages. I definitely agree with your interpretation. The point is, however, how can the be here convey such meaning even with the context? For instance, if I'm talking about whether go or not, "to be or not to be" seems to make no sense.
Why are living and dying so special that we can connect them with "be"?