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English definition of “that”

that

conjunction     strong /ðæt/ weak /ðət/
A2 used to introduce a clause that reports something or gives further information, although it can often be left out: She said (that) she'd collect it for me after work. Is it true (that) she's gone back to teaching? We'll be there at about 7.30, provided/providing (that) there's a suitable train. It was so dark (that) I couldn't see anything.Connecting words joining words or phrases with similar or related meanings Grammar: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 moreGrammar:That-clausesWe use that as a conjunction to link a verb, adjective or noun with the following clause.See moreGrammar:Verb + that-clauseVerbs commonly followed by that include reporting verbs (say, tell, admit, etc.) and mental process verbs (believe, think, know, hope, etc.):See moreGrammar:Adjective + that-clauseWe use be + adjective + that-clause to express opinions and feelings. Some adjectives commonly used in this way are sure, certain, right, important, afraid, pleased, sorry, surprised, worried. We can omit that with no change in meaning:See moreGrammar:Noun + that-clauseWe use a noun + that-clause to express opinions and feelings, often about certainty and possibility. We also use that with reporting nouns. Some nouns commonly used in this way are belief, fact, hope, idea, possibility, suggestion, statement, claim, comment, argument:See moreGrammar:Verb patterns: verb + that-clauseSee moreGrammar:Reporting verbs + that-clauseSome verbs connected with reporting can be followed by a that-clause acting as the direct object (underlined in the examples):See moreGrammar:Verbs followed by an indirect object and a that-clauseSome verbs (generally those connected with reporting) can be followed by an indirect object (underlined) plus a that-clause acting as the direct object:See moreGrammar:Verbs followed by a prepositional phrase and a that-clauseSome verbs can be followed by a prepositional phrase (underlined) and a that-clause acting as the direct object:See more
(Definition of that conjunction from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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