Every sentence has a head, a body and legs: who or what it’s about, what they do, and what they do it to. These are the words for its parts, and for the two things a sentence can do, claim and ask.
- kernel noun
- The small core a sentence is built from: an actor, an operator and an action, with an acted-on when there is one. On the route, a step's kernel words are the short, frequent words that fill those places first: the forms of be, have and do, the modals, and verbs like go. Learners over-practise the kernel in claims and questions, then grow it: She could go. She could go up the hill.Zellig Harris and Noam Chomsky called a language's simplest sentences its kernel in 1957, the sentences the others were transformed from. Here the kernel is what's built first, and the rest grows onto it in time.
- actor noun
- Who or what the sentence is about, usually the one doing the action. In the picture of a sentence as a head, a body and legs, the actor is the head: she in She could go.
- action noun
- What the actor does: the body, as go is in She could go. A sentence with a form of be and no other verb, like She is here, has no action.
- acted-on noun
- Who or what the action is done to: the legs, as the note is in She could read the note. Not every sentence has one. She could go doesn't.
- operator noun
- The first helping verb in a sentence: the word that carries not and moves to the front to make a question, as could does in She could go and Could she go? Operators are the modals and the forms of be, have and do that can move to the front, like is, has and did. Been, being and done never move, so they are never operators.Adopted from Randolph Quirk, Sidney Greenbaum, Geoffrey Leech and Jan Svartvik, A Comprehensive Grammar of the English Language (Longman, 1985).
- modal noun
- An operator that says how sure, able, allowed or bound the claim is: can, could, will, would, shall, should, may, might and must. The nine modals are always operators. The semi-modals (have to, ought to, going to, used to) mean what modals mean but don't move to the front themselves: Do we have to go? Are we going to go?
- query noun
- A question word: who, what, where, when, why or how. A query asks for more than yes or no, and it comes before the operator: Where could she go? The name keeps it apart from the operator.
- claim noun
- A sentence that says something is so: She could go. I am.
- question noun
- A sentence that asks. A yes-or-no question puts the operator in front of the actor: Could she go? Am I? A query question starts with a query: Where could she go?
- flip noun and verb
- Moving the operator across the actor, to turn a claim into a question and back: She could go. Could she go? On the word cards, the card that moves is outlined.