Can I omit "on" with change in meaning?
Still pacing around (on) the roof, he suddenly stopped. He came down to the others and told them about an idea he'd come up with.
on makes it clear that he is on the roof. Without on , he might be on the ground pacing around the house and looking up.
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on makes it clear that he is on the roof. Without on, he might be on the ground pacing around the house and looking up.