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These sentences are wrong: in English, subject and verb have a grammatical number, which must agree. An affix grammar can express this directly: Sentence → Subject + number Predicate + number Subject + number → Noun + number Predicate + number → Verb + number Object Object → Noun + number Noun + singular → John Noun + singular → Mary
Phrase structure rules break sentences down into their constituent parts. These constituents are often represented as tree structures (dendrograms). The tree for Chomsky's sentence can be rendered as follows: A constituent is any word or combination of words that is dominated by a single node. Thus each individual word is a constituent.
Reed–Kellogg diagram of the sentence. The sentence is unpunctuated and uses three different readings of the word "buffalo". In order of their first use, these are: a. a city named Buffalo. This is used as a noun adjunct in the sentence; n. the noun buffalo, an animal, in the plural (equivalent to "buffaloes" or "buffalos"), in order to avoid ...
Noun phrases can be identified by the possibility of pronoun substitution, as is illustrated in the examples below. a. This sentence contains two noun phrases. b. It contains them. a. The subject noun phrase that is present in this sentence is long. b. It is long. a. Noun phrases can be embedded in other noun phrases. b. They can be embedded in ...
Derivational morphology is a process by which a grammatical expression is turned into a noun phrase. For example, in the sentence "Combine the two chemicals," combine acts as a verb. This can be turned into a noun via the addition of the suffix -ation, as in "The experiment involved the combination of the two chemicals." There are many suffixes ...
Noun phrases are phrases that function grammatically as nouns within sentences, for example as the subject or object of a verb. Most noun phrases have a noun as their head. [5] An English noun phrase typically takes the following form (not all elements need be present):
A sentence consisting of at least one dependent clause and at least two independent clauses may be called a complex-compound sentence or compound-complex sentence. Sentence 1 is an example of a simple sentence. Sentence 2 is compound because "so" is considered a coordinating conjunction in English, and sentence 3 is complex.
A further modification is the lexicalized PCFG, which assigns a head to each constituent and encodes rule for each lexeme in that head slot. Thus, where a PCFG may have a rule "NP → DT NN" (a noun phrase is a determiner and a noun) while a lexicalized PCFG will specifically have rules like "NP(dog) → DT NN(dog)" or "NP(person)" etc.