Vincent Teo Can I say, (a) The thief crept (up) the stairs to the room. (b) He crept onto / on the stairs. (c) He crept the stairs.
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Vincent TeoCan I say,(a) is the only one that sounds natural to me, with 'up'. We can climb [the] stairs, but 'creep' isn't a transitive verb.
(a) The thief crept (up) the stairs to the room.
(b) He crept onto / on the stairs.
(c) He crept the stairs.