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English definition of “that”

that

pronoun (USED TO REFER)    strong /ðæt/ weak /ðət/ (plural those)
B1 used as the subject or object of a verb to show which person or thing you are referring to, or to add information about a person or thing just mentioned. It is used for both people and things. It can often be left out: I can't find the books (that) I got from the library. Is this the train that stops at Cambridge? Have you been to the restaurant that's just opened in town?Relative forms Grammar:It, this and that in paragraphsWe use it, this and that to introduce further information about a topic already mentioned. However, the words have different uses.See moreGrammar:Relative pronounsRelative pronouns introduce relative clauses. The most common relative pronouns are who, whom, whose, which, that. The relative pronoun we use depends on what we are referring to and the type of relative clause.See moreGrammar:Relative pronouns: thatWe use that instead of who, whom or which in relative clauses to refer to people, animals and things. We use it to introduce defining clauses only. That is more informal than who, whom or which:See moreGrammar:No relative pronounIn informal styles, we often leave out the relative pronoun. We only do this in defining relative clauses, and when the relative pronoun is the object of the verb. We don’t leave out the relative pronoun when it is the subject of the verb nor in non-defining relative clauses:See moreGrammar:ThatThat is a very common word in both writing and speaking. We use it as a determiner, a demonstrative pronoun and a relative pronoun. We also use it as a conjunction to introduce that-clauses.See moreGrammar:That: determiner and pronounWe use that most commonly to point to a thing or person. We use it with singular nouns. The thing or person is often distant from the speaker and sometimes closer to the listener, or not visible to either the speaker or listener:See moreGrammar:That: relative pronounWe use that to introduce defining relative clauses. We can use that instead of who, whom or which to refer to people, animals and things. That is more informal than who or which:See moreGrammar:That-clausesWe also use that to introduce that-clauses after some verbs, adjectives and nouns:See moreGrammar:That: other usesSee more
(Definition of that pronoun (USED TO REFER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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