Quick question about kudasaimasu

[Taurus]

So in my Minna no Nihongo textbook, くださいます　(kudasaimasu) is listed as a class I verb - the meaning is listed as 'give (respectful equivalent of くれます)'.

I figured that if it was a class I verb, the dictionary form of the verb would be くださう　(kudasau), but when I google that, it doesn't look like that's the case. Am I being stupid, or is there a mistake in the textbook, or is it irregular, or is there another reason why it wouldn't be kudasau (I did try googling, but evidently my googling skills aren't up to the task).

What about the dictionary form of いただきます？

[Neil53]

At the extreme risk of commenting tooooo much. Here are my bakarashi iken.

下さる くださる - Godan verb special class and conjugation - goes to kudasai, kudasaimasu etc.

頂く いただく - goes to itadakimasu.

[Psy]

Yeah, while they do tend to tell you that all verb conjugations are complete regular, there are a few oddball exceptions, the formal ones being among them:

くださる --> くださいます
なさる --> なさいます
いらっしゃる --> いらっしゃいます

There might be others but these are all that come to mind. Luckily, once you know them there isn't much else to worry about.

[Taurus]

So they are irregular. Thanks! Just wanted to make sure I wasn't going mental.