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Is "caused by" passive or active?
Cramp is a sudden strong pain caused by a muscle suddenly contracting
moseen A cramp is a sudden strong pain (which is) caused by a muscle suddenly contracting . Here you have a reduced relative clause. The unreduced version is formed by adding 'which is', as shown above.
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moseenA cramp is a sudden strong pain (which is) caused by a muscle suddenly contracting.
Here you have a reduced relative clause. The unreduced version is formed by adding 'which is', as shown above. In the unreduced form you have "is cause