Common Error Detection
Find out whether there is any grammatical error in below sentence.This book is / designed to increase / a working knowledge of / spoken and written English.

This book is
a working knowledge of
designed to increase
No error
spoken and written English

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Common Error Detection
Find out whether there is any grammatical error in below sentence. The presumption that the average investor does not understand / or take interest in the affairs of the company / is not correct.

is not correct
or take interest in the affairs of the company
The presumption that the average investor does not understand
No error

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