# Vocative 
Vocative is a case.  Case is the form of a word that helps someone to know the function of the word in a sentence. 

Case helps the reader to know what the word is doing in a sentence. 

The vocative case names the person or thing being directly addressed. 

## What types of words use case? 

* **Noun**- Case on a noun helps the reader to know how someone or something relates to the action of the verb. 
* **Article**- Case on an article helps the reader know which word the article is attached to. 
* **Adjective**- Case on an adjective can help the reader to know which noun the adjective is describing. If the adjective is not used to describe something and it acts like a noun, case helps the reader to know how the word relates to the action of the verb. 
* **Participle**- Case on a participle is used in the same way as it is with the noun or adjective. 

### More information about this topic
In Greek, the vocative case is often formed in the same way as the nominative case. A word in the vocative case will often look the same as the same word in the nominative case.