This final topic does not teach a new rule. It trains you to find the ONE error hiding inside a sentence that looks correct at first glance, and to combine everything you have learned into a single answer.
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An error-spotting sentence is broken into parts. Exactly ONE part is wrong — the rest are correct. Your job is to find which part, and why.
📌 The error-spotting method
Check subject-verb agreement first — it is the single most common error tested.
Then check prepositions, articles and tense — one at a time, part by part.
If every part looks fine, the answer is "No error" — do not force a mistake that is not there.
✨ Worked example
Sentence
find the one wrong part
Each of the students / have submitted / their project / on time.
The error
subject-verb agreement
"have" should be "has" — "each" is always singular.
The hardest Achievers questions ask you to apply TWO rules in one transformation — for example, changing both the voice and the speech together.
📊 Two rules, one sentence
| Original | After combined transformation |
|---|---|
| She said, "I am writing a letter." | She said that she was writing a letter. (direct → indirect + tense backshift) |
| He said, "The window was broken by the boys." | He said that the boys had broken the window. (passive → active + tense backshift) |
Olympiad trap: When two transformations are needed, doing only one of them is the most common way marks are lost. Always re-check the finished sentence against BOTH original rules before choosing an answer.
The final stretch — questions that draw on nouns, tenses, voice, speech and vocabulary all at once, exactly as the real Achievers section does.
Pro tip: When a question feels like it is testing "everything at once", solve it rule by rule instead of guessing the whole sentence — check agreement, then tense, then word choice, one at a time.
12 Achievers-level questions combining error spotting and multi-rule transformations from across the whole book.
