Classification of Japanese sentences

IX. Humble forms of desu and arimasu : De gozaimasu and gozaimasu
Those forms are called a humble form. They are used when it is necessary for the speaker to humble himself in order to show a respect, or a deference, etc. to the
hearer. They are also used when the speaker realizes the need to be humble talking about the group to which the speaker belongs, or things belonging to the speaker or his group.

A. De gozaimasu means the same as desu. The information girl in Dialogue 6-1 uses this form twice, in lines six and ten. They are :

(Kutsu'uriba wa) Kono kai de gozaimasu.
"The shoe department is on this floor."
Kutsu'uriba wa sono oku de gozaimau.
"The shoe department is beyond that."

Because kutsu'uriba is owned by the department store and the informahon girl is working for the store, she uses de gozaimasu instead of desu when she speaks to their customers.

Examples
1. Ruin de gozaimasu.
"I'm Mr. Lwin."
2. Kanai de gozaimasu. (Kanai: my wife)
"This is my wife."
3. Kono hon wa watashi no ja gozaimasen.
"This book isn't mine.

B. Gozaimasu is used in the same way as arimasu, but is different from de gozaimasu.

Examples
1. a. Koko ni watashi no ga gozaimasu.
"Here is mine."
b. Kore wa watashi no de gozaimasu.
"This is mine."
2. a. Esukareetaa no tonari ni kaban'uriba ga gozaimasu.
"There is the bag department next to the escalator." (Lit.)
b. Esukareetaa no tonari ga kaban'uriba de gozaimasu.
"The department next to the escalator is the bag department."