V. + (어/아)도 => "even if," "although," "even though"

V. + (어/아)도
=> "even if," "although," "even though" This construction supposes a real or an unreal event/situation and draws a conclusion. When it is used with 아무리 . . . (어/아)도, it means "no matter how . . ."

• 급한 일이 있어도 전화가 없어서 연락할 수 없어요.
  => Even if there's an emergency, I can't contact you because I have no phone.
  
• 친구를 사귀어도 자주 만날 수 없어요.
  => Although I make friends, I can't meet with them often.
  
• 아무리 추워도 나가야 돼요.
  => No matter how cold it is, you/I have to go out.