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In Genki II (second ed.), page 168 we are given polite forms of some verbs,
among them する with なさる. They have also written that some of them have
irregular conjugations in long forms, among them なさる, which becomes なさいます.
However, in tangorin.com the conjugation table says なさります while Jisho.org
recognizes both as forms of なさる. At the same when I type なさります or なさいます into
google.com I get about 900 000 or 600 000 results respectively. Are both forms
correct? Or is one of them just a common mistake?
CC BY-SA 3.0
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question
grammar conjugations
Proper form of なさる - なさります or なさいます
They are both OK. なさります is the original, but り sometimes changes to い. This is
called イ音便{おんびん}.

イ音便 <https://kotobank.jp/word/%E3%82%A4%E9%9F%B3%E4%BE%BF-430840>

なさいます
<https://kotobank.jp/word/%E3%81%AA%E3%81%95%E3%81%84%E3%81%BE%E3%81%99-346682>

なさります
<https://kotobank.jp/word/%E3%81%AA%E3%81%95%E3%82%8A%E3%81%BE%E3%81%99-588645>
CC BY-SA 3.0
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answer
There are five honorific (subsidiary) verbs of _almost_ r-consonant (type I)
conjugation that have very peculiar style of irregularity, ending in い in 命令形
(command form) and before ます.

```

    plain form　　　regular masu-stem　　 masu(-only)-stem　　command form
    いらっしゃる　　いらっしゃり-たい　　いらっしゃい-ます　　いらっしゃい
    おっしゃる　　　　おっしゃり-たい　　　おっしゃい-ます　　　おっしゃい
    くださる　　　　　　くださり-たい　　　　ください-ます　　　　ください
    ござる　　　　　　　　ござり-たい　　　　　ござい-ます　　　　ござれ／ござい†
    なさる　　　　　　　　なさり-たい　　　　　なさい-ます　　　　　なさい
    --------
    なる (regular)　　　　　なり-たい　　　　　　なり-ます　　　　　　なれ
    
```

† so rare that I can't decide which is more natural...  
(Alignment adjusted for half/full-width fonts such as MS Gothic, may not work
in other settings.)

These verbs are used predominantly in this irregular style, and using regular
conjugation would have various extra effects depending on the verb, from just
sounding a bit old-fashioned to making you into a ninja...

PS
["なさります"](https://www.google.co.jp/search?q=%22%E3%81%AA%E3%81%95%E3%82%8A%E3%81%BE%E3%81%99%22)
and
["なさいます"](https://www.google.co.jp/search?q=%22%E3%81%AA%E3%81%95%E3%81%84%E3%81%BE%E3%81%99%22)
have 26,800 and 430,000 hits in Google.co.jp, respectively.
CC BY-SA 3.0
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answer