What part of speech is imperative?

"Imperative" is not a part of speech. It is a grammatical mood — a category of verb forms that indicates the speaker's attitude or intention towards the action described by the verb.

Here's the breakdown:

* Part of speech refers to the grammatical function of a word in a sentence (like noun, verb, adjective, etc.).

* Mood describes how the verb is used to express a particular attitude, intention, or relationship between the speaker and the listener.

The imperative mood specifically expresses a command, request, or instruction. For example:

* Close the door. (command)

* Please, sit down. (request)

* Go to the store. (instruction)

In these sentences, the verbs "close," "sit," and "go" are in the imperative mood.