I would say that many, many copulative/linking/intensive verbs are
followed by prepositional phrases as part of their complementation:

He was under several delusions

The now turned into slush

They continued in their several perceptions (Henry James, I think)

They felt under an obligation

etc.

I would just say that copulative/linking/intensive verbs often have
the potential to be followed by

an Adjective Phrase

a Noun Phrase

or

a Prepositional Phrase

but I would not say that these prepositional phrases are adverbial,
just another form of subject complement.

I defer to others, with better drawing programs (and abilities) to
produce a tree diagram, but I would do the sentence in question as a
complement, not an adjunct modifier.

KMW




>I know we recently tossed around the classifications of "such as" and "for
>example," but a student stumped me with this one:
>
>What is the function of the word "like" in the following sentence: "It feels
>like summer"?  Would "like summer" be an adverb clause describing how "it"
>feels?  I recognize "it" as the dummy placeholder subject, but "feels" here
>works as a linking verb describing a perception and should therefore be
>followed by an adjective instead of an adverb, right?   How would you work
>this out on a tree diagram?
>
>I found this in the OED:
>
>    7. predicatively, in certain idiomatic uses, chiefly with the vbs. feel,
>look, sound:    a. With gerund as regimen: Having the appearance of (doing
>something).    b. Giving promise of (doing something); indicating the
>probable presence of (something).    c. colloq. In recent use (orig. U.S.),
>to feel like: to have an inclination for, be in the humour for.
>
>
>Thanks,
>Heather Fester
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