pronoun
a word that takes the place of a noun or noun phrase, such as 'which've' replacing 'which have'
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I have not seen the documents which’ve been requested by the client.
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I can't find the keys which’ve been missing since yesterday.
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I don't know where the party is tonight, but I heard it's at John's place, which’ve got a cool setup.
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The memories of our childhood, which’ve faded over time, still hold a special place in my heart.