As you see in this example of online Cambridge dictionary,"they" is used to refer "a porsche". How can it possible?
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4In the Cambridge sentence, they refers to all (new) Porches, not just the one the speaker wants to buy. – J.R. Aug 18 '18 at 19:55
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1To add on to J.R.'s comment, "it costs an arm and a leg" would imply that this one particular Porsche is very expensive, but using "they" establishes that Porsches as a group are always expensive. – Nicole Aug 18 '18 at 20:01
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The key to this sentence is when they use *a Porsche* which indicates they are referring to a class i.e. all Porsches. Had they said this Porsche it would have been better the use it costs an arm and a leg. – Tom B Aug 19 '18 at 01:01
