The stem of the masu form of a verb, with the honorific prefix o-, is followed by kudasai to express a polite request, usually one directed at a social superior or customer. Kudasai is the polite imperative form of the verb kudasaru ("give") and is used here as an auxiliary verb. Usually the adverb dōzo ("please") is used with kudasai, at the beginning of the sentence.
To express a polite request using a noun-plus-suru verb, kudasai follows the noun, and the stem of suru is dropped altogether (ex., 3).
Generally speaking, the prefix o- attaches to native-Japanese verbs (ex., 1, 2), and go- to verbs of Chinese origin (ex., 3)
Dōzo o-hairi kudasai.
Please come in.
Dōzo ii shūmatsu o o-sugoshi kudasai.
Have a nice weekend.
Dōzo mō ichido go-setsumei kudasai.
Please explain once more.
Hope this helps!
°˖ ✧◝(○ ヮ ○)◜✧˖ °こゆうきあいはら°˖ ✧◝(○ ヮ ○)◜✧˖ °