I prefer the second. The first seems to be talking more about an individual instance of the article "a" for this particular sentence, while the second seems to be talking more about the article "a" as something that exists independently of any particular use in any particular sentence.
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AnonymousYou should add an article 'a' before the word 'pen'.
You should add the article 'a' before the word 'pen'.
Which sentence above is correct?
If both are possible, is there any difference in meaning?