What Does Verbs -(으)세요 mean in Korean?

-(으)세요 is used when politely asking the listener to do something, or when making a request, or when giving directions or orders. It corresponds to ‘please (do)’ in English. When the verb stem ends a vowel, -세요 is used, and when it ends in a consonant, -으세요 is added.

-(으)세요 is more polite than -아/어요 when making requests or demands. The formal polite style of -(으)세요 is -(으)십시오.

가다 (to go) + -세요  -> 가세요

받다 (to receive) + -으세요 -> 받으세요

만들다 (to make) + -세요 -> 만드세요 (irregular conjugation of ㄹ)

When  -(으)세요 is used in the imperative sense to give an order, it can only be used with verbs and cannot be used with 이다 or adjectives. Adjectives must be changed to their verb forms:

의사이세요 (wrong) -> 의사가 되세요. Please become a doctor.

기쁘세요 (wrong) -> 기뻐하세요. Be happy.