There are also Honorific and humble styles of speech, and writing.
The honorific style is for the elevation of the listener who is older or higher in social status than the speaker.
The humble style is to lower the speaker, or the family member to elevate the listener indirectly.
Hara-sensei ga o-hanashi ni narimasu.
腹-先生 が お-話 に なります。
Prof. Hara will speak about it.
Chichi ga o-hanashi itashimasu.
父 が お-話 致します。
My Father will speak about it.