日本語
keigo
(in the Japanese language) honorific words ; honorific language
けいごの つかいかたは むずかしいです。
It's difficult to use honorific language.
"tantou sasete itadakimasu" is a humble expression meaning "tantou shimasu". It is used in deference to the home residents and visitors.
いたす
to do (humble form)
いらっしゃい
Welcome (said to someone who is visiting)
いらっしゃる
to come (honorific form)
to be (honorific form)
to go (honorific form)