What's the best way to say "someone" in Korean?
For example :
"Someone was looking for you a minute ago"
"I met someone at school who likes basketball"
"Someone told me that Koreans think America is dangerous."

My attempt:
"아까 어떤사람이 너를 찾고있었어요."
"학교에 농국좋아하는사람이 만났어요."
The last sentence is too hard for me to try^^!

Question

What's the best way to say "someone" in Korean?
For example :
"Someone was looking for you a minute ago"
"I met someone at school who likes basketball"
"Someone told me that Koreans think America is dangerous."

My attempt:
"아까 어떤사람이 너를 찾고있었어요."
"학교에 농국좋아하는사람이 만났어요."
The last sentence is too hard for me to try^^!

Answer

-> 아까 어떤 사람이 너를 찾고 있었어(or 찾더라.)
-> 학교에서 농구(를) 좋아하는 사람을 만났어요.(or 알게 됐어요.)
-> 한국인들은 미국을 위험한 나라로 생각한다고 어떤 사람이 말해줬어요.

* "someone" in Korean is translated into 어떤 사람 or 누군가. You can choose the one you prefer.