What does a verb suffix do?

A verb suffix serves the function of denoting action or the act of doing something, which aligns with the correct choice. Verb suffixes, such as -ing and -ed, are added to base verbs to convey various tenses and aspects of actions. For example, "run" becomes "running" to indicate an ongoing action or "walk" becomes "walked" to indicate a completed action.

The other options highlight characteristics that pertain to different parts of speech or aspects of language. Possession is typically shown through noun or adjective forms, while state of being is more commonly associated with linking verbs, which connect the subject to further details. Additionally, not all verb suffixes end in -ed; they can also include other endings like -ing, -en, or even -s, depending on the verb tense or aspect being expressed. This demonstrates that the function of a verb suffix is fundamentally about expressing actions and not limited to a specific form or condition.