What’s the right way to use the phrase it is worth? Which of the following two approaches is right, and how they are different?

  1. It is worth mentioning that [. . .]
  2. It is worth to mention that [. . .]
  • Worth can take a gerund complement, but not an infinitive complement. Hence (1) is OK, but (2) isn't. – John Lawler Aug 10 '15 at 21:31
  • However, worth it can take an infinitive complement. It's worth it to consider the price carefully before you commit yourself But not *It's worth to consider the price carefully before you commit yourself. – John Lawler Aug 10 '15 at 22:47

The first example, "it is worth mentioning that", is acceptable. The second, "it is worth to mention that", is incorrect. One might correct it by saying:

It is worth it to mention that...

Though this is a very awkward construction. A better version might be:

It is worthwhile to mention that...

As to why these particular constructions are acceptable and the others are not, I admit that I'm having a hard time figuring that out myself. I'm not even completely sure what part of speech "worth" is in each of those phrases.

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