Free Error Detection Quiz – Spot the Mistake Online
Read each sentence carefully and choose the option that identifies the grammar mistake. Get instant feedback on each choice. After answering all 5 questions correctly, detailed explanations will appear below each question to help you understand why that part is wrong. Test and learn in a simple and fun way.
Training Your Eye to Catch Mistakes Other People Miss
Error detection questions don't ask you to fill a blank or choose the right word — they give you a full sentence and ask you to find the one part, if any, that's wrong. This makes it one of the most demanding grammar exercises, because you have to actively scan for mistakes rather than just recognise a correct answer when you see it.
This exact format shows up constantly in competitive exams like SSC, banking, and government recruitment tests, precisely because it's hard to guess your way through — you either genuinely understand the rule being tested, or you don't. That makes practising it directly one of the highest-value things you can do before an exam.
The errors in this quiz cover the areas that trip up learners most often: subject-verb agreement, incorrect prepositions, wrong tense forms, and article misuse — often hidden inside a sentence that otherwise reads smoothly. Reading each part of the sentence separately, rather than skimming the whole thing at once, is the fastest way to spot what's wrong.
After each question, don't just check whether you got it right — read the explanation to understand exactly why that part was wrong, since the same rule will likely reappear in a different sentence later. Our Subject-Verb Agreement Quiz drills one of the most frequent error types tested here.