He showed up around ten o'clock.
→  10시쯤 나타났어요.

[예문]
※   show up: 나타나다, 드러내다.
  Sometimes they fail to show up without even a phome call.
   때론 전화한통화도 없이 나타나지 않아요.

A:What time did Ray get to work?
  레이가 몇시에 출근했지?

B:He show up around ten o'clock.
 10시쯤 나타났어요.