Лекции по теоретической грамматике английского языка. Тивьяева И.В. - 87 стр.

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dependent either on the subject or on the predicate. The subject and the predicate
can form a sentence on their own.
e.g. She smiles. He is running.
The Subject
The subject is one of the two main parts of the sentence. It denotes the thing
whose action or characteristic is expressed by the predicate. It may be expressed by
different parts of speech, the most frequent ones being: a noun in the common
case, a personal pronoun in the nominative case, a demonstrative pronoun, a
substantivised adjective, a numeral, an infinitive, and a gerund. It may also be
expressed by a phrase.
The subject performs two main functions: categorial and relative. The
categorial function of the subject consists in naming the possessor of the
predicative feature expressed by the predicate. The relative function of the subject
consists in its being the original element in the syntagmatic development of the
sentence, thus constituting the predicate’s left environment as opposed to its right
environment.
As it has already been mentioned, the subject always goes with the
predicate, therefore, one-member nominal sentences do not have a subject.
The Predicate
The predicate denotes the action or property of the thing expressed by the
subject. It can be expressed by numerous ways. The predicate expresses the
predicative feature which characterized the object expressed by the subject, thus it
realizes the categorial function. Being a link between the subject and the right
environment of the verb, it performs the relative function.
According to morphological characteristics, four types of predicates can be
singled out:
- verbal;
- nominal;
- phraseological;
- contaminated.