that’s the part

How to spot it

The word doing the work here is one of the plainest in English. A sentence takes "part," a noun that ordinarily means a piece of something larger, and promotes it to the status of the thing worth carrying away: that's the part that worries me, this is the part nobody mentions, the part that made us trust the account, my favorite part of the whole afternoon. Once you know the frame you will hear it everywhere. "That's the part" announces itself, and so do its cousins, because the pointing is done out loud.

Finding it is the easy half. The test is the other half, and it is a single question: which part? Try to put a finger on it in the words on either side. A sentence that has earned the promotion answers at once, because the detail is already there or arrives in the same breath. In the stories quoted on this page, the part is two shells aimed too well for luck, or a salvage formula coined a line earlier. A sentence that has not earned it sends you hunting instead. You read forward, you read back, and what you come up with is the subject again, or the general worth of the thing, or a claim you could not quote to anybody else.

There is a smaller signal underneath that one, and it has to do with which way the debt runs. "That's the part" and "this is the part" reach backwards, so they owe a detail already written down. "The part that made us" and "my favorite part of" point forwards, so they owe one in the words immediately after. Either way the sentence has stopped describing and started ranking, and a ranking is a promise. Read the side that owes, and see whether the promise is settled there.

Why models overdo it

Picking its next word, a model has no stake in whether the sentence has earned anything. It is asking what usually comes next, and this is one of the most obliging shapes in written English, because it fits in front of anything at all. Any noun can be promoted, and any paragraph can be told that this is the part that matters. The gesture costs nothing to produce. The detail underneath it costs a great deal, because having one means knowing something specific, and on the page the cheap version and the costly one look identical.

What gives the reflex away is the settlement rather than the frame itself. A generated passage will announce the part that matters most and then say nothing that matters, or name its favorite part of a meeting it never described. The promise lands, the reader waits, and nothing arrives to pay it. An unpaid debt like that slips past easily in prose that is otherwise competent. The grammar around it holds up and the voice is pleasant; what is wrong is a debt nobody collected.

When it's fine

Readers who can find the part the sentence names have no complaint, and good writers manage that more often than a suspicious reader might guess. In Philip K. Dick's "The Gun," the captain, speaking feebly from a cot in the corner, says that's the part that worries me and then hands over the part in the next breath: two shells, both aimed too well for luck, on a ship that was not supposed to be an easy target. Stated flatly, the same facts would read as a damage report. The promotion tells you where in the wreck to look.

Midnight Mass gives Riley Flynn the same move, and there the debt is paid before it is even incurred. Riley lays the account out first, the version of himself that came out when he drank, and the morning he woke up and learned that version had killed someone. Only then does he say that's the part I cannot square, and the part is sitting in the sentence just behind it: a God who could have stopped all of it and let it happen anyway. Rowland's Cicely works the same way in a lighter key, turning on a formula she has only just coined. In each case the writer had the detail first and reached for the frame second. That is the order that keeps you honest. Before you keep a promotion of your own, say in plain words which part you mean. If you can, the frame has earned its place. If you cannot, cut it, because the plain sentence underneath was usually carrying the detail all along.

Where it comes from

English has never had only one way to shove a piece of a sentence into the light. Grammarians group several of them under the name cleft, after the ordinary verb: the sentence is split in two so that one half can hold the spotlight while the other half carries the rest. "It was the schedule that changed" is the it-cleft. "What changed was the schedule" is the wh-cleft, also called the pseudo-cleft, and turning that around gives "the schedule is what changed." Reference grammars treat these as one family, and the frame this lesson is about stands at its conversational edge: a pointing word, a copula, and in the slot where an argument might sit, the plain noun "part."

The plainness is most of the trick. Latin pars, in the accusative partem, meant a share or a portion, and the word travelled through Old French into English in the thirteenth century carrying nothing grander than that. It picked up jobs as it went: a part in a play, a part of speech, a part in a quarrel, the part of a machine you replace when it wears out. None of that weight is rhetorical, which is exactly why a speaker can promote the word without sounding like an orator. "The schedule is what changed" announces a case being made. "That's the part that worries me" sounds like somebody telling you something across a table.

Linguists working on information structure describe the effect from the listener's side. Marking one element as new or contrastive is what concentrates attention on it, and the mark holds only because there is a genuine element behind it to be marked. That is the oldest thing on this page, older than any of the names for it. Speakers relied on it long before grammarians wrote the names down, because someone listening has no page to reread, and the only way to make one detail stand out in speech is to say out loud that it stands out. The frame survived into ordinary conversation for the same reason it survived into fiction and testimony. It is the cheapest honest way to tell somebody where to look.