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27) The distributional model of the sentence. The model of immediate constituents

Methods of structural linguistics are based on the notions of position, co-occurrence and substitution (substitutability).

Position, or environment is the immediate neighbourhood of the element.Cooccurence means that words of one class permit or require the occurrence of words of another class.The total set of environments of a certain element is its distribution. The term distribution denotes the occurrence of-an element relative to other elements. Elements may be in: 1) non-contrastive distribution (the same position, no difference in meaning; variants of the same element): hoofs hooves 2) contrastive distribution (the same position, different meanings):She is charming.She is charmed.3) complementary distribution (mutual exclusiveness of pairs of forms in a certain environment; the same meaning, different positions; variants of.the same elements).: cows—oxen.

The distributional model, worked out by Ch.Fries ("The Structure of English shows the linear order of sentence constituents .The syntactic structure of the sentence is presented as a sequence of positional classes of words:

Tho old man saw a black dog there.

    1. D A1 N1 V D A2 N2Adv

    2. D 3aA 2 D 3b1b 4

Showing the linear order of classes of words (their forms may also be indicated), the model does not show the syntactic relations of sentence constituents. The sentence I saw a man with a telescope is ambiguous, but the ambiguity cannot be shown by the distributional model. This drawback is overcome by the IC-model.A sentence is not a mere sequence, or string of words, but a structured string of words, grouped into phrases. So sentence constituents are words and word groups. The basic principle for grouping words into phrases (endo or exocentric) is cohesion, or the possibility to substitute one word for the whole group without destroying the sentence structure. Applying the substitution test, {or the dropping test, dropping optional elements) we define syntactic relations and can reduce word-groups to words and longer sentences to basic structures:

{I) NP ->Npoor John -> John,

The phrase is endocentric, the adjunct poor is optional, the head-word John is obligatory.

(2)Theoldman sawа black dog there.

Word-groups are reduced to head-words and the sentence is reduced to the basic structure, directly built by two immediate constituents — NP and VP.

When we know the rules of reducing the sentence to the basic, elementary structure, it is not difficult to state the rules of extending/expanding elementary sentences:

So the sentence is built, by two immediate constituents (NP+VP), each of which may have constituents of its own. Constituents which cannot be further divided, are called ultimate (UC). The IСmodel exists in two main versions: the analytical model and the derivation tree. The analytical model divides the sentence into IC.-s and UC-s:

VP

The derivation tree shows the syntactic dependence of sentence constituents:The old man saw a black dog there.So the iС-model shows both the syntactic relations and the linear order of elements.

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