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Why does the author use ‘longer’ but not ‘long’ here?longer

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  • can you please edit to replace the image with typed text. It will make searching for your question easier.
    – James K
    Apr 23, 2018 at 6:01

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Example #4 is explaining what prepositions are used in relation to short periods of time, such as a single day or the weekend period (often Saturday and Sunday).

Example #5 is explaining the use of the preposition "in" when referencing longer periods of time (periods longer than those identified in Example #4).

The author could have simply used "long," but chose instead to continue with the context started in Example #4.

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