Is this the correct form for a question without a verb?

Banyoda mısın?

Yes Bod, completely correct this time.

"be" is a verb. isn't it?

Greetings,
In Turkish we don't have the verb "be" like in English. As you know in English the "be" verb has the following forms:

Simple present tense : am, is, are
Present perfect tense : has been, have been
Simple past tense : was, were

When you change the word order you simply make a question. All these features in English are compelely unknown to Turkish. We don't have a "be" verb, not for affirmative sentences nor for questions.