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This grammar pattern is used to show your choice. You can use ‘-거나’ to connect two verbs to each other with ‘or’.
● 시간이 있으면 영화를 보거나 책을 읽어요. (When I an free, I watch movies or read books)
● 너무 춥거나 비가 오면 소풍은 취소하겠습니다. (The picnic will be cancelled if it’s too cold or rainy.)