Observation: The Prevalent Confusion of Number
Stop letting your predicates wag the verb’s tail!

In a coherent English sentence, the verb agrees with the subject in number: One subject IS singular; two subjects ARE plural. The number of the subject noun or pronoun determines the verb’s number. That’s pretty simple. Regrettably, though, this basic rule of clear communication is breaking down in popular American speech.
I first noticed the error creeping into speech a few years ago, and initially it was limited to sentences that use “what” as the subject pronoun. Admittedly, this usage can invite confusion: When it begins a declarative sentence as the subject, the word “what” stands in for “the thing that,” and it always starts out as indeterminate. In effect, it introduces a momentary mystery or puzzle that awaits resolution.
The usual function of the verb in these sentences is to link the subject pronoun to a complementary predicate phrase that reveals missing information about the nature or characteristics of the subject. Here’s a famous example (from the iconic movie Cool Hand Luke): “What we have here is a failure to communicate.”
The most common linking verb is “to be,” but other verbs often used to link a subject noun to a complementary predicate phrase of descriptive properties include “appear,” “seem,” “look,” “become,” “sound,” “taste,” and “remain,” among others.
For the sake of clarity in communication, the grammar of our language presumes by default that the indeterminate subject pronoun “what” is singular in number. That’s a necessary starting presumption because, at the outset of the sentence, the listener doesn’t yet know whether the thing being discussed will turn out to comprise a unified whole or multiple constituent parts.
For example, if a general in the field asks a lieutenant what he’s looking at through his binoculars, it would be proper English for the lieutenant to reply: “Sir, what I see IS … three tanks and two companies of troops moving directly toward our position.” Strunk and White’s Elements of Style (3rd edition 1979), at page 11, provides another correct example: “What is wanted IS a few more pairs of hands.”
In recent times, however, it’s become quite prevalent — almost ubiquitous — for Americans to say “ARE,” rather than “IS,” in sentences like those above: “What I see ARE three tanks.” “What we need ARE five gallons of water.” These constructions are grammatically WRONG — the speaker errs by letting the plural predicate phrase control the number of the linking verb in place of the singular subject pronoun.
Listen for this error — you’ll find it’s infected nearly all conversational speech and is now spreading into advertising scripts and, increasingly, into more formal spoken and written texts:
Here’s a sentence, from an obviously carefully crafted script, read by Verizon’s CEO Hans Vestberg in a high-production infomercial touting the rollout of his company’s new 5G Ultra wireless service (at 5:50 of the video 5G Ultra Show): “What is truly inspiring ARE the things people are using it for.” Yikes. And here’s one from a political Web site: “What is wholly new, however, ARE the number of American elites who are eager to help the Chinese dictatorship in its quest for global hegemony.” And from an NBC Olympics commentator: “What I love about her skiing ARE her turns.”
You might protest that the linking verb in these “what” sentences is a lot like an equal sign: If A equals B and C, then B and C should equal A. And if that’s the case, you might ask, what’s the real harm if the speaker dispels the mystery of “what” for the listener a little sooner by signaling through the verb that the thing in question is, in fact, plural, not singular? You end up at the same place.
Well, one risk is that when a grammatical mistake gains widespread currency in a particular usage, even a narrow type of usage like “what” sentences, it won’t remain confined to that usage. And that’s what I perceive is happening with the error of number in linking verbs: If you tune your ears a little finer, you’ll notice that this error is metastasizing beyond “what” sentences. More and more, you hear people in conversation, in presentations, in television commercials, and in a growing range of more formal speech using faulty sentences like these:
“The biggest problem she had with Trump WERE his inflammatory Tweets.”
“The best thing about Walmart ARE the everyday low prices.”
“The cause of all the problems ARE the leaking pipes.”
“The only thing I regret ARE the books I never bought.”
“He said the only thing that was cold WERE his hands.”
And this one from my old friend Bill Barr in his recent book One Damn Thing After Another: Memoirs of an Attorney General (p.235): “THE BACKBONE [singular subject noun] of the department ARE [plural linking verb] the ninety-three United States Attorneys and their staffs of prosecutors and civil litigators around the country [plural predicate noun].” Oh, no, Bill, not you, too!
In all these examples, the author has erred by letting the plural predicate phrase determine the number of the linking verb in conflict with the singular number of the subject noun. This breach of the fundamental grammatical rule of number agreement between subject and verb in sentences with linking verbs now dominates popular speech and writing in America.
Some might insist that conventions of grammar do and should evolve with the changing usages of popular speech. It’s true that what is deemed grammatically acceptable in English usage has evolved gradually over time and is not the same today as it was, say, in the 17th century. But I’m not aware of any recognition or even assertion that there’s been a change in the requirement of number agreement between subject and verb.
Moreover, whatever process of evolution occurs in accepted language usage over the long term, the reality of that gradual evolution is not reason to jettison contemporary rules of grammar in deference to the latest capricious trend. What is ultimately at stake in preserving subject-verb agreement is the clarity and effectiveness of our communications — and few things could be more fundamental to the health of society.