What part of.speech is Have?

"Have" can be a few different parts of speech depending on its function in a sentence:

* Verb: This is the most common usage. It can be a main verb expressing possession, experience, or action.

* Auxiliary verb: It helps form other verb tenses, like the present perfect ("I have eaten") or the past perfect ("He had finished").

* Modal verb: In cases like "I have to go", it indicates necessity.

Examples:

* Verb: "I have a cat."

* Auxiliary verb: "They have been studying all night."

* Modal verb: "You have to be kidding me!"