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In linguistics, a copula is a word that is used to link the subject of a sentence with a predicate (a subject complement or an adverbial). Though it might not itself express any action or condition, it serves to associate the subject with a predicate that could not stand by itself.

A copula is sometimes (though not always) a verb or a verb-like part of speech. (in English primary education grammar courses it is often called a linking verb).

The term is generally used to refer to the main copular verb in the language: in the case of English, this is "to be". It can also be used to refer to all such verbs in the language: in that case, English copulas include, "to be", "to become", "to get" and "to seem".


1 The copula in English

1.1 Use

We can identify several sub-uses of the copula:

The copula "to be" also has some non-copular uses, including:

Note that the auxiliary verb function derives from the copular function; and, depending on one's point of view, one can still interpret the verb as a copula and the following verbal form as being adjectival.

1.2 Conjugation

As in most Indo-European languages, the English copula is the most irregular verb, due to constant use. Most English verbs (traditionally known as "weak verbs") have just four separate forms, e.g. "start", "starts", "starting", started". A large minority of verbs (traditionally known as "strong verbs") have five separate forms, e.g. "begin", "begins", "beginning", "began", "begun". "To be" is a very special case in having eight forms: "be", "am", "is", "are", "being", "was", "were", "been". Traditionally, it had even more, including "art", and "wert".

2 The copula in other languages

Languages tend to use the copula in quite different ways.

In Indo-European languages, the words meaning "to be" (originating in stem *es) often sound similar to each other. Due to the high frequence of their use, their inflection retains a considerable degree of similarity in some cases. Thus, for example, the English form is is an apparent cognate of Russian jest', in spite the fact that the two belong to language groups that had split at least three thousand years ago and have had very little interaction since ( twentieth-century19th century 20th century 21st century more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901- 2000 in the sense of the Gre borrowings notwithstanding).



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