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.

The correct answer is: E. No error

The sentence is grammatically correct. The word “designed” is used correctly to describe the purpose of the book. The word “knowledge” is followed by the preposition “of,” and the noun phrase “spoken and written English” is the object of the preposition. The sentence is clear and concise, and it conveys the intended meaning effectively.

Here is a brief explanation of each option:

• Option A: “This book is” is the subject and verb of the sentence. The subject and verb agree in number, and the sentence is grammatically correct.
• Option B: “designed to increase” is a participial phrase that modifies the noun “book.” The participial phrase is grammatically correct.
• Option C: “a working knowledge of” is a prepositional phrase that modifies the
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  noun “knowledge.” The prepositional phrase is grammatically correct.
• Option D: “spoken and written English” is a noun phrase that
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  is the object of the preposition “of.” The noun phrase is grammatically correct.
• Option E: “No error” is the correct answer. The sentence is grammatically correct.