Phrase

Key takeaways

Phrase belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Phrase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Phrase from memory before moving on to harder problems.

Reference excerpt

In grammar, a phrase — called an expression in some contexts — is a group of one or more words acting as a grammatical unit. It can be used within a sentence, so this means that a phrase can be treated as a unit within a larger structure. For instance, the English sentence "the squirrel is very happy" is a clause phrase which contains the noun phrase "the squirrel" and the verb phrase "is very happy". Additionally, "very happy" is an adjective phrase. Phrases can consist of a single word or a complete sentence. In theoretical linguistics, phrases are often analyzed as units of syntactic structure such as a constituent. There is a difference between the common use of the term phrase and its technical use in linguistics. In common usage, a phrase is usually a group of words with some special idiomatic meaning or other significance, such as "all rights reserved", "economical with the truth", or "kick the bucket". It may be a euphemism, a saying or proverb, a fixed expression, a figure of speech, etc. In linguistics, these are known as phrasemes. In theories of syntax, a phrase is any group of words, or sometimes a single word, which plays a particular role within the syntactic structure of a sentence. It does not have to have any special meaning or significance, or even exist anywhere outside of the sentence being analyzed, but it must function there as a complete grammatical unit. For example, in the sentence Yesterday I saw an orange bird with a white neck, the words an orange bird with a white neck form a noun phrase, or a determiner phrase in some theories, which functions as the object of the sentence.

Phrase trees Many theories of syntax and grammar illustrate sentence structure using phrase 'trees', which provide schematics of how the words in a sentence are grouped and relate to each other. A tree shows the words, phrases, and clauses that make up a sentence. Any word combination that corresponds to a complete subtree can be seen as a phrase. There are two competing principles for constructing trees; they produce 'constituency' and 'dependency' trees and both are illustrated here using an example sentence. The constituency-based tree is on the left and the dependency-based tree is on the right (where adjective (A), determiner (D), noun (N), sentence (S), verb (V), noun phrase (NP), prepositional phrase (PP), verb phrase (VP)):

The tree on the left is of the constituency-based, phrase structure grammar, and the tree on the right is of the dependency grammar. The node labels in the two trees mark the syntactic category of the different constituents, or word elements, of the sentence. In the constituency tree each phrase is marked by a phrasal node (NP, PP, VP); and there are eight phrases identified by phrase structure analysis in the example sentence. On the other hand, the dependency tree identifies a phrase by any node that exerts dependency upon, or dominates, another node. And, using dependency analysis, there are six phrases in the sentence. The trees and phrase-counts demonstrate that different theories of syntax differ in the word combinations they qualify as a phrase. Here the constituency tree identifies three phrases that the dependency trees does not, namely: house at the end of the street, end of the street, and the end. More analysis, including about the plausibilities of both grammars, can be made empirically by applying constituency tests.

Heads and dependents In grammatical analysis, most phrases contain a head, which identifies the type and linguistic features of the phrase. The syntactic category of the head is used to name the category of the phrase; for example, a phrase whose head is a noun is called a noun phrase. The remaining words in a phrase are called the dependents of the head. In the following phrases the head-word, or head, is bolded:

too slowly — Adverb phrase (AdvP); the head is an adverb very happy — Adjective phrase (AP); the head is an adjective the massive dinosaur — Noun phrase (NP); the head is a noun (but see below for the determiner phrase analysis) at lunch — Preposition phrase (PP); the head is a preposition watch TV — Verb phrase (VP); the head is a verb The above five examples are the most common of phrase types; but, by the logic of heads and dependents, others can be routinely produced. For instance, the subordinator phrase:

before that happened — Subordinator phrase (SP); the head is a subordinating conjunction—it subordinates the independent clause By linguistic analysis this is a group of words that qualifies as a phrase, and the head-word gives its syntactic name, "subordinator", to the grammatical category of the entire phrase. But this phrase, "before that happened", is more commonly classified in other grammars, including traditional English grammars, as a subordinate clause (or dependent clause); and it is then labelled not as a phrase, but as a clause. Most theories of syntax view most phrases as having a head, but some non-headed phrases are acknowledged. A phrase lacking a head is known as exocentric, and phrases with heads are endocentric.

Functional categories Some modern theories of syntax introduce functional categories in which the head of a phrase is a functional lexical item. Some functional heads in some languages are not pronounced, but are rather covert. For example, in order to explain certain syntactic patterns which correlate with the speech act a sentence performs, some researchers have posited force phrases (ForceP), whose heads are not pronounced in many languages including English. Similarly, many frameworks assume that covert determiners are present in bare noun phrases such as proper names. Another type is the inflectional phrase, where (for example) a finite verb phrase is taken to be the complement of a functional, possibly covert head (denoted INFL) which is supposed to encode the requirements for the verb to inflect – for agreement with its subject (which is the specifier of INFL), for tense and aspect, etc. If these factors are treated separately, then more specific categories may be considered: tense phrase (TP), where the verb phrase is the complement of an abstract "tense" element; aspect phrase; agreement phrase and so on. Further examples of such proposed categories include topic phrase and focus phrase, which are argued to be headed by elements that encode the need for a constituent of the sentence to be marked as the topic or focus.

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Illustrations

Worked examples

Example 1 — a first encounter with Phrase

Start with the simplest possible case. Write down what Phrase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Phrase before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Phrase ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Phrase

In research: Phrase appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Phrase in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Phrase is common in secondary-school and first-year university syllabi. It links to neighbouring topics Phrases, Syntactic categories, so understanding it makes those chapters shorter.
In everyday life: Look for Phrase outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Phrase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Phrase means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Phrase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Phrase in simple terms?

In grammar, a phrase — called an expression in some contexts — is a group of one or more words acting as a grammatical unit. It can be used within a sentence, so this means that a phrase can be treated as a unit within a larger structure.

Why does Phrase matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Phrase?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Phrase.