English grammar error-spotting (‘‘one of my …’’ requires plural noun): Read the four parts and pick the erroneous segment; select ‘‘No error’’ only if none is wrong: ‘‘One of my favourite actor / is acting / in this play also. / No error.’

Given data

• A uses a singular count noun after ‘‘one of my …’’

Concept / ApproachAfter ‘‘one of my/our/the …’’, the noun must be plural because you choose one member from a set: ‘‘one of my favourite actors’’.

Correction‘‘One of my favourite actors is acting in this play also.’’

Common pitfalls

• Keeping the head noun singular after ‘‘one of …’’

Final AnswerOne of my favourite actor