Errors in English Usage presents eleven elementary tests built around spotting mistakes in English sentences. Each test contains ten questions, three labelled choices for identifying the faulty expression, and a space marked “Your entry” for recording a response. The exercises ask learners to notice how a small change in wording can affect grammatical accuracy or meaning. Early sections address familiar difficulties such as using many with information, adding an unnecessary to after let, choosing verb forms after modal verbs, and distinguishing adjectives from adverbs. Other questions examine uncountable nouns, subject and verb agreement, reciprocal expressions, and words that sound similar but have different spellings or meanings. Dedicated tests focus on present tense usage, relative pronouns, and prepositions within everyday expressions. Several later tests connect the questions through short conversational situations. A disagreement about smoking becomes an exercise in spelling and word choice, while a mistaken telephone call introduces errors involving possessives, verb forms, and common phrases. Another sequence follows Sue Sarville as she introduces Bristol, mentions its balloon fiesta, and describes her daily routine at a finance company. These practical settings give the sentence exercises a recognizable context without turning the collection into a continuous story. The supplied pages contain questions rather than explanatory lessons or an answer key, making the workbook a focused resource for practising error recognition.