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That

Word used in English language for several purposes

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The word did not originally exist in Old English, and its concept was represented by þe. Once it came into being, it was spelt as þæt (among others, such as þet), taking the role of the modern that. It also took on the role of the modern word what, though this has since changed, and that has recently replaced some usage of the modern which.

Pronunciation of the word varies according to its role within a sentence, with a strong form, and a weak form, .

Modern usage

The word that serves several grammatical purposes. Owing to its wide versatility in usage, the writer Joseph Addison named it "that jacksprat" in 1771, and gave this example of a grammatically correct sentence: "That that I say is this: that that that that gentleman has advanced, is not that, that he should have proved." That can be used as a demonstrative pronoun, demonstrative adjective, conjunction, relative word, and an intensifier.

  • That as a demonstrative pronoun refers to a specific object being discussed, such as in "that is a cat"; the word is a distal demonstrative pronoun, as opposed to proximal, because there is distance between the speaker and the object being discussed (as opposed to words such as this, where there is a relative sense of closeness).
  • When used as a demonstrative adjective, that describes which specific object is being discussed; for example, in the phrase "that spotted dog is Fido", that specifies which particular dog is Fido among all spotted dogs.
  • In its usage as a conjunction, it connects clauses together, such as in "I know that Peter is right". In sentences with several clauses, that is also used as a discriminator to differentiate between subjects of a clause.
  • As a relative pronoun, that introduces restrictive clauses, such as in "the different factors that are fundamental and specific to particular features"; in a study of medical science journals in Britain leading up to 2004, it was found that that had been largely replaced by the word which when used in this context, while writing that is increasingly formal—ranging from verse to fiction to nonfiction—finds that usage decreasing as wh- words (interrogatives) relatively increase. Some linguists instead classify this use of that as a relativizer.
  • That is used as a relative adverb, such as in "it doesn't cost that much". When used in this way, that requires inferences be drawn by the listener to determine the meaning of the speaker.
  • The word also intensifies elements of a sentence, similar in function to the word so, such as when one says "I was that ill ... I couldn't even stand up." But just as in its use as a relative adverb, that as an intensifier is best understood when the addressee infers meaning from its usage. In the example given, that intensifies and refers to a possible view already held by the addressee (whether the speaker was not seriously ill), even though the speaker does not explicitly confirm or intensify this previously held belief.

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Source and licence. Adapted from the Wikipedia article “That” (this version, 2026-09-04) by its contributors, shared under CC BY-SA 4.0. Lablypedia has left out its tables, references and most pictures, and linked it to other Lablypedia articles.