A sentence is divided into three parts. Choose the incorrect part. If no error is in the sentence, choose option (D)
Remember to switch of / the lights / before leaving the hall / No error
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Always verify correct usage of phrasal verbs. "Switch off'' means to turn off a device or light.
The phrase "switch of" is incorrect. The correct phrasal verb is "switch off" (to turn off). Therefore, the corrected sentence should be: "Remember to switch off the lights before leaving the hall."