Thanks.
Quote:
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2. 'a' was not omitted. It is not required.
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2. It functions as (a) modification. (Why isn't 'a' required? Modification is not a count noun?)
What about these? What do these mean?
1. I have five slices of apple.
2. I have five slices of
(an) apple. (If 'an' is not required, why?)