how much can we read in elliptically

0Hi,02br
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00Once in a while, when I ask questions on usage of English articles, I think someone nice come up with the answer that says something has an indefinite article, 'a' or 'an', because it is to be read elliptically.02br
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00eg,02br
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00in a good two months 02br
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00the poor 02br
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00I think those are rather understandable and I do readily accept them but sometimes, I see instances where a short phrase is inserted to make situations acceptable or understandable to English learners. To me now, how much to read into the sentences is the question. Is there a reasonability factor involved here? Should I follow the recommendation like 'if it is used, then use it'? 0-