As the the title says, I never thought about this until now. But, is "it's and "you're" still considered to-be verbs? Since they have "is" and "are" in their meaning?
Yes, if that is the ONLY verb. However, is and are can also be auxiliary verbs, for example: You're sprinting for the finish = You are sprinting for the finish <= the root verb is to sprint, appearing in present progressive tense.
