お - Wikipedia 「オー」のうち、歴史的仮名遣いで「オ段+お・ほ・を」と書かれていたものは、現代仮名遣いでは「オ段+お」と書く。 凄いものを見て驚いたときなどに，この一文字を発することもある。
JLPT N5 Grammar: お ご (o go) Polite Marker Particle Meaning . . . For some vocabulary words (like お茶 ocha), it is standard to use this prefix and it is considered rude to not use it NOTE: お (o) is mostly used with words of Japanese origin, and ご (go) is mostly used with words of Chinese origin, though there are some exceptions
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