Is or a recognized word?

"Is" is definitely a recognized word! It's a verb that means "to exist" or "to be."

It's a very common word and is used in many different ways in English. For example:

* "Is" as a present tense verb: "The cat is sleeping."

* "Is" as part of a question: "Is that your book?"

* "Is" as part of a phrase: "That is the problem."

Let me know if you have any other questions about words!