Colloquial language in front of high status person


When speaking to teachers, to boss works, to strangers and high status person
we have to use the honorific language, like です and ます, 謙譲語 and 尊敬語. On the
other hand, with friends and family members it's used a more colloquial
language. So far so good.

But when we speak to ourself (note: **to ourself** , **not of ourself** ), is
the colloquial language acceptable? I give an example to better understand my
question (this is my example, so it can be grammatical wrong, sorry for
that!):

[code]

    先生:ああ、田中くん、今日の宿題やった?
    田中:(思わずに声だしてつぶやいた)あ、しまった。えっと、家に忘れました、先生。
    
[/code]

It's natural?




If you mean monologues (as seen in manga, anime, or stage plays), they are
normally in informal language, even when the character is in front of their
boss.

As an exception, some stereotypical
[お嬢様](https://www.japanesewithanime.com/2018/05/ojousama.html) and highly
loyal servants speak in polite language even in monologues. When an お嬢様 speaks
this way, it probably means that she was raised like royalty, not a commoner.




If you mean monologues (as seen in manga, anime, or stage plays), they are
normally in informal language, even when the character is in front of their
boss.

As an exception, some stereotypical
[お嬢様](https://www.japanesewithanime.com/2018/05/ojousama.html) and highly
loyal servants speak in polite language even in monologues. When an お嬢様 speaks
this way, it probably means that she was raised like royalty, not a commoner.

