Many times, this expression used after an already stated quantity (usually a small one) to further emphasize the unlikelihood of something by using hyperbole.
Other times, to refer simply to a noun.
Examples:
Sally is only able to have two of those candies, if any (at all).
I don't think I've ever had more than three conversations with him, if any (at all).
Her feelings, if any, were not shown.
-It is used as a continuation to an already mentioned noun - and, in so doing, it takes the same verb associated with that noun
Examples (based on the above sentences):
Sally is able to have two of those candies, if (She is able to have) any.
I don't think I've ever had more than three conversations with him, if (I've had) any (with him).
Her feelings. If (she has) any (at all), were not shown.
Hope this helps!
Please add a couple examples of how you've seen it used. The word pair can mean different things in different contexts. – J.R. – 2014-07-31T23:43:57.207