Use of possessive 's

angelsrolls

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“Her political resume is incredibly slight when compared with that of Mr. Biden.”
Source: http://www.washingtontimes.com

Do you think there should be the possessive ‘s at the end of Mr. Biden?
 

jutfrank

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No, it's not necessary because of that of.

If you omitted that of, then the 's would be required.
 

angelsrolls

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His cheapest car is more expensive than that of George’s.

What about the above sentence? Is it necessary to put the ‘s in this sentence?
 

GoesStation

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His cheapest car is more expensive than that of George’s.

What about the above sentence? Is it necessary to put the ‘s in this sentence?
No, it's incorrect. That of George = George's.
 

angelsrolls

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Then, "the cheapest car of George" would be a correct utterance, right?
 
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