Error Spotting
🔒 Log in to trackTense and sequence-of-tenses errors
🔒 Log in to trackTense errors come in four reliable shapes.
| Signal | Required tense | Trap |
|---|---|---|
| yesterday, last year, in 1998, ago | simple past | mixing with present perfect |
| already, just, yet, ever, since, for, so far | perfect (present, unless earlier past is meant) | when I reached, the train had already left |
| since + point of time / for + period | perfect or perfect continuous | for ten years, never since ten years |
| when-clause / if-clause / as soon as (future meaning) | simple present — no will | I will call you when the meeting ends. |
| earlier of two past actions | past perfect; later action → simple past | The patient had died before the doctor came. |
| since + past clause | present perfect in main clause | It has been raining since he left. |
| used to / would | past habit | not use to |
Anchor discipline: every sentence carries its time information in anchor words. Locate the anchor first; the verb must obey it. Since ten years is a double failure — since demands a point of time (since 2015) and a ten-year span needs for.
Two past events: the earlier one takes past perfect, the later simple past. But do not demand perfect forms where plain sequence is meant — after before/after the perfect is optional if the order is already clear.
Future-in-clauses: after when, before, after, until, as soon as, if referring to the future, English uses present tense — I will call you when the meeting ends — never will end.
Reported-speech spillover: in error-spotting, a reporting verb in the past (asked, said) forces backshift in the reported clause: He asked why he had failed, not why did he fail (word order also reverts to statement order).
Perfect-continuous partners: has/have been + -ing pairs with since/for: She has been working here for ten years.
Detailed notes
Tense errors: the anchor decides
Every sentence sits at a point in time, fixed by an anchor — a word or phrase that names the time (yesterday, since 2019, by the time, as soon as). The verb must obey the anchor. Tense questions fail when the verb and the anchor disagree.
The main anchors and their verbs
| Anchor | Tense | Correct / Incorrect |
|---|---|---|
| yesterday, last week, ago, in 2019 | simple past | He left two days ago. / |
| since + point, for + length, so far, yet, already, just | perfect forms | She has been teaching since 2015. |
| every day, usually, now (habit) | simple present | The shop opens at nine. |
| when / if / until / as soon as + future meaning | simple present | |
| earlier of two past events | past perfect | The train had left before I reached. |
| universal truths | simple present | The earth moves round the sun. |
Rules examiners love
- Time and condition clauses never take will. After when, before, after, until, as soon as, if, unless pointing to the future, use the simple present: Correct: I will call you when the meeting ends. Incorrect: …when the meeting will end.
- Since vs for: since + point of time (since 2015, since morning); for + length (for ten years). Incorrect: since ten years.
- Past perfect for the earlier event. When two past actions are narrated, the earlier one takes had + participle: Correct: The patient had died before the doctor arrived. Signal words: by the time, before, already.
- Present perfect refuses finished-time words. Have gone clashes with yesterday, last week, in 2019: Incorrect: He has left for Hyderabad two days ago. → Correct: He left for Hyderabad two days ago.
- Universal truths stay in the simple present, even inside a past sentence: The teacher explained that the earth moves (not moved) round the sun.
- Sequence of tenses: a past reporting verb pulls the reported clause into past forms — said that she was busy — but a universal truth is exempt (rule 5).
Two-step method for tense questions
- Find the anchor: circle the time words in every part.
- Check the verb against the anchor table. If a verb sits inside a when/if/until clause with will in it, or next to ago in a perfect tense, you have found the error.
Quick revision
- ago / yesterday / last… → simple past only; never with has/have.
- since + point, for + length — never since ten years.
- when/if/until/as soon as + future meaning → simple present (no will inside the clause).
- Earlier of two past events → past perfect (had + participle), cued by by the time, before, already.
- General truths stay simple present, even in reported past speech.
Types of questions asked
Every way this subtopic shows up in exams — how to recognise it, the formula or logic to use, and a solved example.
Type 1: Will inside a when / if / until clausevery common2 practice Q
The sentence talks about the future but the clause beginning with when/if/until/as soon as contains will + verb.
- Find the time or condition word (when, if, until, before, as soon as).
- If it points to the future, its clause must use the simple present.
- Will stays only in the main clause.
Why it works: English fixed this rule long ago; the future helper never enters the time clause.
Example: "The chief guest will not leave the venue until the cultural programme (1) ______." will conclude / concludes / concluded / is concluding
Until-clause about the future → simple present: concludes. 'Will conclude' inside the clause is the error.
Type 2: Since vs forvery common2 practice Q
A perfect or perfect-continuous verb is followed by a time phrase, and the choice is between since and for.
- Ask what the time phrase names: a POINT (2015, morning, marriage) or a LENGTH (ten years, two hours).
- Point → since; length → for.
- 'Since ten years' type phrases are planted errors.
Why it works: the two words divide all time references between them; mixing them breaks the sentence.
Example: "My uncle has been teaching in this school (1) ______ fifteen years." since / for / from / during
Fifteen years is a length → for. 'Since fifteen years' is the classic planted error.
Type 3: Past perfect for the earlier of two past eventscommon2 practice Q
Two past actions appear in one sentence, often with before, after, by the time, or already.
- Put the two actions on a timeline.
- The earlier one takes had + participle; the later one takes simple past.
- A plain past where the perfect belongs (or will after 'by the time') is the error.
Why it works: past perfect exists precisely to mark the earlier of two pasts; dropping it erases the order.
Example: "When we reached the hall, the play (1) ______, so we watched from the back." already began / had already begun / has already begun / was already beginning
The play started BEFORE we reached → earlier event → past perfect: had already begun. 'Already began' loses the order.
Type 4: Present perfect with a finished-time wordcommon2 practice Q
A has/have/had + participle sits next to yesterday, ago, last week, or another closed time slot.
- Look for ago, yesterday, last…, in 2019 next to a perfect form.
- A closed time slot demands the simple past.
- Correct the perfect form to simple past (or drop the time word — but the part with the verb is the error).
Why it works: the present perfect connects to NOW; a finished-time word cuts that connection.
Example: "Ravi (1) ______ for Hyderabad two days ago to attend an interview." has left / left / had left / was leaving
'Two days ago' is a closed slot → simple past: left. 'Has left…ago' is the planted error.
Type 5: Universal truth / general fact pulled into the pastoccasional2 practice Q
A sentence reports what someone said or explained, and the reported clause states a scientific or permanent fact.
- Check the reported clause for a general truth (the earth, water, the sun, metals).
- Such truths stay in the simple present even after a past reporting verb.
- A past form there (moved, revolved) is the error.
Why it works: sequence of tenses has a standing exception for facts that are always true.
Example: "The teacher explained that the earth (1) ______ around the sun." moved / moves / had moved / was moving
Universal truth → present: moves. 'Moved' wrongly applies the sequence-of-tenses rule to a permanent fact.
Shortcut tricks
⚡ Underline every anchor
Circle yesterday/ago/since/for/by the time/when/next week before judging any verb. Most tense questions answer themselves once the anchors are visible.
Example: When I reached / the station, the train / already left / without a whistle.
Two past events: reaching came after the train's leaving → earlier event needs past perfect: had already left. Part 3.
⚡ Will-check
Scan for will inside a when/if/until clause with future meaning — SSC plants this trap repeatedly.
⚡ Since/for sorting
Since + starting point (since Monday, since 2019, since childhood); for + duration (for ten years, for a week). Wrong partner = wrong part.
Where students lose marks
Using present perfect with a finished-time anchor ('I have met him yesterday').
Backshifting only half a sentence: 'He said he will come' → 'would come'.
Choosing past perfect wherever two past verbs appear, even in simple chronological narration.
Writing 'since + duration' because it sounds formal.
Practice sets — 12 questions
Sets of 10, mixed across the question types above. Each answer comes with a step-by-step explanation.
Topic test · 12 questions
Suggested time 7 min · wrong answers go to your mistake notebook automatically.