Subject and Predicate

The most familiar grammatical function is the SUBJECT. In notional terms, we can think of the Subject as the element which performs the "action" denoted by the verb:

[1] David plays the piano

[2] The police interviewed all the witnesses

In [1], the Subject David performs the action of playing the piano. In [2], the Subject the police performs the action of interviewing all the witnesses. In these terms, this means that we can identify the Subject by asking a wh-question:

[1] David plays the piano

Q. Who plays the piano? A. David ( = Subject)

[2] The police interviewed all the witnesses

Q. Who interviewed all the witnesses? A. The police (= Subject)

Having identified the Subject, we can see that the remainder of the sentence tells us what the Subject does or did. In [1], for example, plays the piano tells us what David does. We refer to this string as the PREDICATE of the sentence. In [2], the Predicate is interviewed all the witnesses.

Here are some more examples of sentences labelled for Subject and Predicate.

Subject	Predicate
The lion	roared
He	writes well
She	enjoys going to the cinema
The girl in the blue dress	arrived late

In each of these examples, the Subject performs the action described in the Predicate. We've seen, however, that there are problems in defining verbs as "action" words, and for the same reasons, there are problems in defining the Subject as the "performer" of the action. The Subject in John seems unhappy is John, but we would hardly say he is performing an action. For this reason, we need to define the Subject more precisely than this. We will look at the characteristics of the Subject on the next page.

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