-(으)면 – Korean if / when

The basic conditional: 비가 오면 집에 있어요 = If it rains, I stay home. Vowel stems take -면, consonant stems take -으면.

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Key rules

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비가 오면 집에 있을 거예요 Bi-ga omyeon jibe isseul geoyeyo If it rains, I'll stay home (으)면 is the basic 'if' conditional. 오다 → 오면.
피곤하면 쉬세요 Pigonhamyeon swiseyo If you're tired, rest Adjective stem + 면. 피곤하다 → 피곤하면.
공부하면 합격할 거예요 Gongbuhamyeon hapgyeokhal geoyeyo If you study, you'll pass 하다 verb + 면.
싸면 살 거예요 Ssamyeon sal geoyeyo If it's cheap, I'll buy it 싸다 (cheap) → 싸면.
먹으면 기분이 좋아질 거예요 Meogeumyeon gibuni joajil geoyeyo If you eat, you'll feel better Consonant ending + 으면. 먹다 → 먹으면.
시간이 있으면 오세요 Sigani isseumyeon oseyo If you have time, come 있다 → 있으면.
모르면 물어보세요 Moreumyeon mureobo-seyo If you don't know, ask 모르다 → 모르면.
날씨가 좋으면 갈 거예요 Nalssiga joeumyeon gal geoyeyo If the weather is good, I'll go 좋다 → 좋으면.

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