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> 「ダンブルドア先生は大切な用事をいつも俺に任せてくださる。おまえさんを迎えに来たり、グリンゴッツから何か持ってきたり....俺を信用し
> **ていなさる** 。な?」 (Harry Potter, Japanese TL)  
>  Professor Dumbledore always entrusts important errands to me. Things like
> picking you up, bringing something from Gringotts (bank).... _he trusts me_
> , right? (My TL)

I don't understand the ending on 信用する here. The original book say "(he) knows
he can trust me".

I'm guessing this is a keigo thing. I know なさる is the honorific form of する,
but I don't see how する would fit in this structure. 信用していする looks like
nonsense to me.

Having said that, while writing this question, I've just seen from the
dictionary that 呈{てい}する is a word meaning "to show/display/exhibit". I had
thought we were dealing with some continuation of state (ている) kind of thing.
But now I'm thinking we have 信用し (continuative form of 信用する) + 呈する, where する
has been made honorific by changing to なさる. Putting it together I get "he
shows trust in me".

  1. Is my analysis correct?
  2. As a native/fluent speaker is this instantly obvious. My brain went straight for the continuation of state (ている) interpretation.
  3. How common is this 呈する? In what situations is it used? Could you please give some more examples?

Footnote: I also saw [this
link](https://japanese.stackexchange.com/questions/95503/understanding-%E3%81%A6%E3%81%84%E3%81%AA%E3%81%95%E3%82%8C%E3%82%8B)
but I think it is unrelated.
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question
grammar meaning keigo
Meaning of 信用していなさる
It's `信頼して + い + なさる`. 呈する is not used in this sentence.

なさる is a godan verb that not only serves an honorific for する but also attaches
the masu-stem of any verb and acts as an honorific auxiliary:

  * 食べなさる to eat (honorific)
  * 食べなさります to eat (polite + honorific)
  * 食べなさりました ate (polite + honorific + past)
  * 食べなされ Eat please! (honorific + imperative)
  * 食べていなさる is eating (honorific + progressive)

Note that these are correct but dated expressions. They mainly appear today as
part of the role language of old people or fictional samurai.

In modern Japanese, you are probably more familiar with the irregular
conjugated forms of なさる. Actually, the familiar ～なさい form is originally a
slurred version of ～なされ:

  * **お** 食べなさ **い** ます to eat (honorific; see [this](https://learnjapanesedaily.com/japanese-%E3%81%8A-%E3%81%AA%E3%81%95%E3%82%8B-grammar-o-nasaru.html))
  * 食べなさい Eat!
  * 食べていなさい Keep eating!

See:

  * [Proper form of なさる - なさります or なさいます](https://japanese.stackexchange.com/q/32700/5010)
  * [なさい and ください using い-stem instead of う-stem](https://japanese.stackexchange.com/q/91192/5010)
  * [what grammatical structures in this word 考えなさんな?](https://japanese.stackexchange.com/q/83410/5010)

JFYI, 呈する is a tricky verb. You can say 運転なさる or 勉強なさる, but instead of 呈なさる or
愛なさる, you must say 呈しなさる or 愛しなさる. See: [Conjugation of する verbs like
発する](https://japanese.stackexchange.com/q/78047/5010)
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answer