A verb is a kind of word that tells about an action or a state. It is the main part of a sentence: every sentence has a verb. In English, verbs are the only kind of word that changes to show past or present tense.[1]
Every language in the world has verbs, but they are not always used in the same ways. They also can have different properties in different languages. For example, in some other languages (e.g., Chinese & Indonesian) verbs do not change for past and present tense. This means the definition above only works well for English verbs.
There are sixteen verbs used in Basic English. They are: be, do, have, come, go, see, seem, give, take, keep, make, put, send, say, let, get.
There have been offered several examples of English-language nouns which do not have any reference: drought, enjoyment, finesse, behalf (as found in on behalf of), dint (in dint of), and sake (for the sake of).[8][9][10] Moreover, there may be a relationship similar to reference in the case of other parts of speech: the verbs to rain or to mother; many adjectives, like red; and there is little difference between the adverb gleefully and the noun-based phrase with glee.
Linguists often prefer to define nouns (and other lexical categories) in terms of their formal properties. These include morphological information, such as what prefixes or suffixes they take, and also their syntax – how they combine with other words and expressions of particular types. Such definitions may nonetheless still be language-specific, since syntax as well as morphology varies between languages. For example, in English it might be noted that nouns are words that can co-occur with definite articles (as stated at the start of this article), but this would not apply in Russian, which has no definite articles.
There have been several attempts, sometimes controversial, to produce a stricter definition of nouns on a semantic basis. Some of these are referenced in the Further reading section below.