접속사 when
When we left the fair, it was not so dark.
When James met Lisa, they were 10 years old.
I was sleeping when my mom called me.
when은 ‘~할 때’의 의미를 나타내며, 두 문장을
연결해요. when이 문장 맨 앞에 위치할 때는
when절 뒤에 쉼표(,)를 써요.