Normally, when you say "The orange on the table is rotten" you mean that there is only one orange on the table and that it is rotten. There could be other oranges, but they are not on the table. If you say "An orange on the table is rotten" You mean that there are several oranges on the table, but only one of them is rotten.
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handtalkwould adding commas like sentence #2 below change the meaning?No. Adding commas would just turn it into an incorrectly punctuated sentence.
handtalkA boy picks up the orange and finds out that it's gone bad.Then it's not on the table anymore. He says, "Mom, this orange is rotten".