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About this tool
Master English grammar by identifying and correcting errors in sentences with detailed explanations.
Sentence correction practice shows you a flawed English sentence and four rewritten versions, and asks you to pick the one that fixes it — then explains the rule that made the difference. Questions are drawn from seven error types (subject-verb agreement, tenses, pronouns, prepositions, modifiers, parallelism, and idioms and usage) at beginner, intermediate or advanced level. It suits anyone preparing for a competitive exam's verbal section or tightening up their written English.
Open Sentence Correction Practice on AltFTool — it loads instantly in your browser.
Choose a Category Focus and a Difficulty Level under Practice Settings — the counter shows how many questions match — then press Start Practice for a round of up to 10.
Select one of the four options labelled A to D; your first click locks in, the correct version highlights, and the Explanation panel states the rule before Next Question.
Press View Results after the last question to see your score and percentage with a Review Responses list, then Try Again or Change Settings.
Every question reveals why the other three options fail — for example that the subject of 'The box of chocolates' is box, so the verb is singular.
Pick one of the seven grammar categories and one difficulty band and the round is built only from questions that match.
The results screen replays every item with the original sentence, what you chose, and the correct version side by side.
Up to 10 questions, shuffled at random from whatever pool your category and difficulty filters leave. Each question has exactly four options labelled A to D.
Seven: subject-verb agreement, tenses, pronouns, prepositions, modifiers, parallelism, and idioms and usage. You can practise one at a time or leave the filter on All Categories to mix them.
No. The first option you select is locked in, the correct one is highlighted immediately, and the explanation appears below — so it rewards reading the sentence carefully before committing.
One point per correct first answer, reported at the end as a raw count and a percentage of the questions in that round. Nothing is saved between rounds, so closing the tab clears your history.