Here's a breakdown:
* Linking verbs connect the subject to a noun, pronoun, or adjective that renames or describes it. The complement provides this renaming or description. Examples:
* He is a doctor. (Doctor renames the subject "He")
* The sky is blue. (Blue describes the subject "sky")
* Action verbs describe an action. The complement can be a direct object (receiving the action) or an indirect object (receiving the direct object). Examples:
* She wrote a letter. (Letter is the direct object, receiving the action of writing)
* He gave her a gift. (Her is the indirect object, receiving the direct object "gift")
Let me know if you'd like more examples or have any other questions!