on is required. up is optional. So any combination except check me or check up me is OK.
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CalifJimon is required. up is optional. So any combination except check me or check up me is OK.Thanks, Jim.
CJ
CalifJimTo check on someone or to check up on someone implies looking in on them periodically (to make sure they are not behaving badly).
To check someone doesn't bring this idea (repeated, unannounced looking) to mind at all. Just checking something (usually not somebody) is examining it to see if it is working properly. When it's a matter of a person, I would