Climb on the roof = climb on structures that are on the roof. Climb the roof — only for one with an acute slope. Climb up the roof = Climb the roof Climb on the building = climb on various protuberances of the building Climb the building = from the bottom to the top Climb up the building = Climb the building
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MustAskI've seen this sentence somewhere on the net:I dare you to climb on the roof!Shouldn't it be "....climb up the roof" ?I cannot judge without further context that reveals the logistics of the situation.