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I've found out that there are several prepositions for the word alternative that all seem to be correct, however, I think there should be a best choice. Do these prepositions affect the meaning in some way?

For:

Ensure that the text alternative for CAPTCHA images identifies the type of task and what is required from the user to complete it

To:

This solution is far from perfect, but it is a potential alternative to Captcha nonetheless.

Of:

In this tutorial, we discussed an alternative of captcha, a plugin called GASP (Growmap Anti spambot Plugin).

Personally, as in my recent article, I do prefer to use "To" as preposition.

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    They are all different. Alternative for [entities that may use this alternative, or the category of the alternative]. Alternative to [the main choice]. Alternative of [another choice, not necessarily predominant].
    – Yang
    May 29, 2015 at 21:19
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    Yes, "an alternative of" .... should be an alternative to. (books.google.com/ngrams/…)
    – TRomano
    May 29, 2015 at 23:11

1 Answer 1

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It's a black-tie event, where...
...the alternative for women is an LBD.
...the alternative to a black tie is a dark blue one.
...the alternative of a spinning bow tie will be rejected by the doormen.

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  • @Tim Romano: You're more accommodating than the doormen, obviously! :) May 30, 2015 at 1:13

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