There are very few examples of English adjectives that take noun phrase (NP) complements. The CGEL lists four: due, like, unlike and worth.
Prepositions typically take NPs as complements (e.g., up the ladder) as do linking verbs (e.g., It remains a difficult problem.). Adjectives don't do that, at least not typically. But we do have the few listed above, for example: he's very like his mother or it's worth the world.
The reason I mention this is that Rodney Huddleston brought one to my attention yesterday morning: underweight. (Geoff Pullum has already blogged about it here and I've added it to the English Wiktionary.) The example that he sent is: "It's a long-run trend of foreign investors -- typically being underweight the banking sector in Australia," Mr Baker said.
To most of us who aren't in finance, though, this will sound rather odd. You may even have a burning desire to put an in between underweight and the the. But as Geoff points out, you can find lots of other examples in the financial papers if you go looking. It's feature, not a bug.
As I was marking essays this morning (which is what I should really be doing now), I realized this is another piece of evidence that to-infinitives do not "function as nouns" despite the common claim that they do. The fact is, English is endowed with plenty of adjectives that take to-infinitives as complements, (e.g., able to, likely to, hard to, etc.) In none of these cases can an actual NP take the place of the infinitive. Moreover, of the adjectives that actually do take NP complement, only due takes to-infinitives complement. Even then, the meaning of due somebody is not the same as due to go.
So what do these to-infinitives function as? Oh, this and that: mostly subjects, adjuncts, and of course, complements in adjective phrases.
I've always thought of like, unlike, and worth as being prepositions rather than adjectives - I guess their ability to take a noun phrase complement was the main criterion for me. Besides that, they don't seem to occur (or only very marginally) as premodifiers to nouns, as (most) adjectives do.
What syntactic features of the use of these words would definitively classify them as adjectives rather than prepositions?
Certainly like and unlike exist as prepositions, but in she's very like her mother, it's clearly an adjective. Unlike prepositions, it can be modified by very and can function as the complement of become. (c.f. *It's very on the shelf or *It became on the shelf.)
I've always thought that to- infinitives can fill NP slots in sentences, but don't have to.
Also, you can (or at least I can) say "They're very like" or "what's it worth?" which mitigates against them being prepositions, at least all the time.
Hi, Ridger! Not sure what you mean about "can...but don't have to." Could you explain?
@The Ridger, FCD: I don't get your comment about "what's it worth?". In "what's it about?", "about" is a (stranded) preposition, no?
Hey, so in "What's it worth?", is that "Adj-stranding"? (And would "worth what is it?" be the "Adjied Adjiadjer" construction?)
Maybe. "it is not worth much" doesn't feel like a PP, though. I could be wrong, I'm not always sure of my own intuitions!
And by "can but don't have to" I only meant that that wasn't the only role they could play.
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