I can’t seem to get this right, I’ve learned the honorific “to be” forms for いらっしゃる,
でございます and ございます but I keep mixing them up when the question asks for “to be (honorific)”.
They can all mean “to be” but apparently they’re not interchangeable.
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いる → いらっしゃる（いらっしゃい（ませ））
ある → ござる（ございます）
（だ・ である）です → でござる（でございます）
Note that だ・である cannot attach to い-adjectives. です does though, and I believe でございます should as well (that would certainly make sense) but I can’t check right now.
At any rate, all the words in the 3rd line are copulas.
BTW, you might’ve noticed the atypical ～ます forms of these verbs.
This same thing happened to くださる too, which is how/why we now have ください 
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Kai has it. This stuff can definitely be a tad confusing at first. Throw in おる as the humble version of いる, I’ve seen many students start getting very confused.
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