Linking verbs connect a subject to a noun or pronoun that renames or describes it. They do not show action.
Examples of linking verbs:
* is
* are
* was
* were
* seems
* becomes
"Reached" is an action verb. It indicates that the subject performed an action.
For example:
* "She reached the top of the mountain." (reached = action)
Let me know if you have other words you want to check!