Sentence Improvement
🔒 Log in to trackTense and sequence fixes
🔒 Log in to trackA large share of improvement items highlight a verb whose tense contradicts a visible anchor.
Anchor → required form:
- yesterday, last week, in 2010, ago → simple past; any perfect form is wrong.
- since/for + still true → perfect or perfect continuous: has been living since 2015 (not is living / lived).
- already/just with an earlier past event → past perfect: had left.
- when/if/until with future meaning → simple present in the clause, will in the main clause only.
- reported speech after a past reporting verb → backshift AND statement word order: asked why I had left (not why did I leave).
Test the pair, not the word: tense errors are relative. The highlighted verb must agree in time with its neighbour. Read the whole sentence across the highlight, never the highlight alone.
Continuous vs simple: continuous forms need an ongoing frame. She was cooking when the guests arrived is right; She cooked when the guests arrived changes the meaning (two sequential events). Improvement questions exploit exactly this contrast — pick the form that preserves the original meaning.
Detailed notes
The anchor decides, again
In improvement items the bold part is often a verb whose tense fights a visible anchor. Circle the anchor before touching the options.
| Anchor in the sentence | Required form |
|---|---|
| yesterday, last week, ago, in 2019 | simple past |
| since + point, for + length, so far, already, yet | perfect (or perfect continuous) |
| every day, at nine (habit) | simple present |
| when / if / until + future meaning | simple present inside the clause |
| by the time + past, earlier of two past events | past perfect |
| said / asked / told (past reporting) | backshifted past forms |
Reported speech: two rules, not one
- Backshift: after a past reporting verb, move the tense one step back — has locked → had locked, will → would, is → was.
- Statement order: an indirect question loses question order — asked why he was late (never why was he late), and takes one connective only — asked whether (never that whether), asked why (never that why).
Conditional frames travel in pairs
- Real future: if + present, will + verb → If he apologises, I will withdraw the case.
- Unreal present: if + past (were for all persons), would + verb → If I were the collector, I would act.
- Unreal past: if + had + participle, would have + participle → If he had studied, he would have cleared. The bold verb may sit in either half; check that the pair matches one row of the table.
Since / for with continuing action
Since 2015, for twenty years, since childhood + an action still true → has/have been + -ing: He has been working in the same mill for twenty-two years (not is working). The anchor for + length cannot live with the plain present continuous.
Watch the second verb too
Some sentences carry two verbs and the anchor governs both. He has left for Delhi and will return next month — the anchor next month is future, so will return is right, and nothing else in the sentence pulls has left into the past. But He has left for Delhi and will return next week with when he will reach… breaks: the when-clause must read when he reaches. After substituting the bold verb, glance at the unbolded verbs once — a fix that clashes with them is not a fix.
How improvement differs from error-spotting
Here the wrong form is already underlined — your task is to produce the right form, not to find it. So after every fix, re-read the WHOLE sentence once: a substitute that fixes the verb but clashes with a word outside the bold part is a trap.
Quick revision
- Circle the anchor first; the verb obeys it.
- ago / yesterday → simple past; since + point → perfect; for + length + continuing → has been -ing.
- Reported questions: backshift + statement order + one connective (why / whether).
- Conditionals come in three fixed pairs; match the pair, don't mix halves.
- Re-read the whole sentence after substituting — the trap may sit outside the bold part.
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: Anchor-based tense fixvery common3 practice Q
The bold verb's tense contradicts a time word sitting in plain sight (already, yesterday, by the time, every morning).
- Circle the anchor.
- Read the anchor's required form off the table.
- Pick the option that matches; reject options that shift tense again (has → had) without a second event.
Why it works: tense questions are anchor questions; with the anchor circled, the options sort themselves.
Example: "When I reached the station, the train (already left)." had already left / has already left / No substitution required / already leaves
The train left BEFORE I reached → earlier past event → had already left. Has already left reaches into the present and breaks the past story.
Type 2: Reported-speech backshift and order fixcommon3 practice Q
The sentence reports what someone asked or said (asked, told, enquired) and the bold part keeps question order, misses the backshift, or glues 'that' to a wh-word.
- Spot the past reporting verb.
- Backshift the tense one step; restore statement order (subject before helper).
- Keep exactly one connective: why / whether / if.
Why it works: indirect speech is direct speech pushed through two fixed machines — backshift and order — and options break one machine each.
Example: "The teacher asked the boy (why was he) late again." why he was / No substitution required / why is he / that why he was
Indirect question → statement order + backshift: asked why he was late again. 'Why was he' keeps question order; 'that why' glues two connectives.
Type 3: Conditional half repaircommon2 practice Q
An if-sentence has mismatched halves: will inside the if-clause, or a real-future frame where an unreal one is meant (If I was → were).
- Read both halves of the conditional.
- Match them to one of the three fixed pairs.
- Real future takes if + present; unreal present takes were; unreal past takes had + participle.
Why it works: the if-clause never hosts will (real future) or would have (unreal past); the options exploit exactly these two guests.
Example: "If he (will apologise) sincerely, I will withdraw the complaint." apologises / No substitution required / would apologise / apologised
Real future condition → if + apologises; the main clause keeps will withdraw. 'Would apologise' is the unreal-present form and breaks the pair.
Type 4: Since / for with a continuing actioncommon2 practice Q
The sentence names a starting point or a length of time (since 1998, for twenty years) while the bold verb is in a plain present or present continuous.
- Ask: does the action still continue? (since + a past point usually says yes.)
- Continuing action → has/have been + -ing (or has/have + participle for states).
- Reject the plain present and the continuous that ignores the length.
Why it works: the perfect exists to tie a past starting point to now; the plain present cuts the tie.
Example: "My father (is working) in the same mill for twenty-two years." has been working / No substitution required / works / had been working
For twenty-two years + still employed → has been working. The plain continuous drops the 'still going' meaning that the length demands.
Shortcut tricks
⚡ Yesterday test
See a finished-time anchor? Kill every perfect and continuous option instantly — one survivor usually remains.
Example: The train has left before we reached the station.
Both events are past; the earlier needs past perfect → had left. 'Has left' is present perfect — dead on rung 1.
⚡ Backshift + straight order
In reported questions after asked/told, two things must change: tense backshifts and the question flips to statement order ('why he had left'). Each option usually breaks exactly one of the two — check both.
⚡ Since/for health check
'Since 2015 / for ten years' demands a perfect form with been if the action continues. Options without have/has been die at once.
Where students lose marks
Choosing present perfect with 'yesterday/last year' because it 'sounds formal'.
Backshifting tense but keeping question order (or vice versa) in reported speech.
Replacing a correct perfect with simple past when 'since/for' is present.
Changing continuous to simple (or back) and silently altering the meaning.
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.