What part of speech shows that something is happening or is?

The part of speech that shows something is happening or is is a verb.

Here's why:

* Action Verbs: These verbs describe actions, like "run," "jump," "eat," or "sleep."

* Linking Verbs: These verbs connect the subject of a sentence to a description or state of being. Examples include "is," "are," "was," "were," "seems," "becomes," and "feels."

Examples:

* Action Verb: The dog barks.

* Linking Verb: The dog is happy.

Let me know if you have any more questions!