"The one that is on top of the building" or "The one on top of the building"
are both sentences correct?
Those are not sentences. To make a sentence, you need a subject and a verb. A: Do you see that large satellite dish?
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Those are not sentences. To make a sentence, you need a subject and a verb.
A: Do you see that large satellite dish?
B: Where?
A: Don't you see the one (that is) on top of that 50-story building?