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.

a working knowledge of
This book is
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. Since the attachment of airconditioned sleeping cars to all important trains, / travelling became very pleasant, / especially during the summer season.

travelling became very pleasant,
especially during the summer season
Since the attachment of airconditioned sleeping cars to all important trains,
No error

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