(1) There is only one copy of the old postage stamp in the world that is certified as being real.
(2) There is only one copy of the old postage stamp in the world, certified as being real.
My non-native English speaking friends think my first sentence is grammatically correct. But, they think my second one is wrong because "that is" cannot be replaced by a comma.
What is your opinion? Thanks.
ansonguy they think my second one is wrong because "that is" cannot be replaced by a comma. I think that it is a poor replacement, at least.
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ansonguythey think my second one is wrong because "that is" cannot be replaced by a comma.
I think that it is a poor replacement, at least.
ansonguyone copy of the old postage stamp in the world
The meaning of this is unclear because you are mentioning one but, you are not mentioning which one in particular. You need to rewrite it.
ansonguythey think my second one is wrong
So do I. Leave out the comma and it's OK.
But while we're talking about this sentence, why not the following?
There is only one certified copy of the old postage stamp.
CJ