I'm going to go check up on your friend. 我得去看看你的朋友怎么样了。

　　Your ex-wife came by this morning to check up on you. 你的前妻今天早上来过，看了看你的状态。

　　The doctor can check up on him here. 医生可以在这对他进行诊察。

　　I get a dental check-up every six months. 我每六个月就会进行一次牙科检查。

　　Vera doesn't look very healthy these days.  维拉这几天气色不大好。

　　Tell her to schedule a check-up with her doctor.  让她找个时间去看看大夫吧。