Is you are in euphoria a sentence?

No, "you are in euphoria" is not a complete sentence. It is a phrase that lacks a subject and a verb.

To make it a complete sentence, you could add a subject and a verb:

* "You are in euphoria." (The subject is "you" and the verb is "are").

* "I am in euphoria." (The subject is "I" and the verb is "am").

Alternatively, you could use a different form of the verb "to be" or add a different verb altogether:

* "You are feeling euphoric."

* "You seem to be in euphoria."

* "You have entered a state of euphoria."