It's worth [ making an appointment before you go ]. Making is a participle verb-form acting as head of the bracketed clause above, which is a complement licensed by worth . Worth can also take noun phrase complements, as in It was worth every penny.
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Aspara GusMaking is a participle verb-form acting as head of the bracketed clause above, which is a complement licensed by worth.In other words, a gerund, roky0071, rather than a participle, in more traditional grammar.