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The salaries of professors are higher than those of secretaries.

[The Jones family,] whose cat is more beautiful than those of their neighbours,....

Trump’s ratings in Western Europe similar to those for Bush in 2008.

These figures were nearly three times as high as those for the second highest category, bus services.

So, I've seen sentences with both "those of" and "those for" and I was wondering if there is any difference between them or they can be used interchangeably.

  • The use of 'of' or 'for' does not depend on the word 'those'. You can replace 'those' with e.g. 'The ratings' - and you should still use 'for'. Someone can probably give the grammatical explanation for this. – Stefan Aug 9 '17 at 17:14
  • Basically, you just use the same preposition in both phrases. So if "Trump's ratings" means "ratings for Trump", you use "those for". It's an example of parallelism, but in some cases the preposition is implied in the first phrase. – Barmar Aug 10 '17 at 19:59

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