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Practise this grammar point with a scored quiz, sentence exercises and writing tasks—all with explanations or review guidance.
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These ten extension questions focus on relative-clause reduction, non-defining clauses, verb patterns, conditional inversion and linking words. They are intended for confident upper-intermediate learners moving into more complex structures, rather than a complete C1 course.
Had I checked the deadline, I would have applied. means If I had checked the deadline, I would have applied. In formal writing, had can move before the subject and replace if in this past conditional. Keep the past participle after the subject.
Reducing a clause is useful only if the tense and active/passive relationship remain clear. Likewise, adding commas can change a restriction into extra information. For each answer, identify what the reader now understands, not merely which sentence sounds shorter.
4 sets · 40 exercises · about 50–70 minutes with writing and review.
10 scored questions, 20 sentence exercises and 10 writing challenges. Time depends on your pace. Start with the quiz or choose the practice you need.
Your scored quiz and self-reviewed exercises are tracked separately on this device.
Questions 1–5 build confidence; 6–10 check transfer and detail. Use Practice for feedback after each answer, or Test yourself to check at the end.
10 questions · 10 XP per correct answer · explanations included
Students waiting outside may enter.. The active clause who are waiting can be reduced to waiting without changing the meaning.
She stopped to call.. Stop to call gives the purpose of the pause; stop calling means the calls ended.
The reports, which arrived yesterday, are ready.. Commas mark a non-defining clause about reports already identified; the second sentence identifies a subset.
would not have missed. Had I checked is an inverted unreal past conditional, equivalent to If I had checked. The past result uses would have + participle.
Despite the delay, the team finished.. Despite can introduce the noun phrase the delay. Although would need a clause, such as although it was delayed.
Had I known, I would have helped.. Remove if and put had before the subject, keeping the past participle known.
Not only did she explain it, but she also gave examples.. Fronted not only requires inversion here: did plus subject plus base verb.
Walking home, I noticed the moon.. The understood walker must be the main-clause subject; I can walk, but the moon and road cannot.
However carefully I checked, I missed a typo.. However plus an adverb can mean no matter how; carefully modifies checked.
The painting is believed to be genuine.. Is believed is followed by a to-infinitive in this passive reporting pattern.
Complete the missing words, then compare the expected form. More than one natural answer may be possible; use the cue and explanation.
have I seen
Rarely have I seen such a clear explanation. (I / have / seen: inversion)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
did she arrive
Not until noon did she arrive. (she / did / arrive: inversion)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
known
Had we known, we would have helped. (know)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
than
No sooner had he arrived than the phone rang.
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
when
Hardly had we sat down when the lights went out.
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
to be
The painting is believed to be genuine. (be)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
to have left
She is said to have left already. (leave: earlier action)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
Despite
Despite having little time, they checked the figures. (use despite)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
written
The report written last week needs revision. (write: passive reduction)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
wishing
Anyone wishing to attend should register. (wish: active reduction)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
Complete the missing words, then compare the expected form. More than one natural answer may be possible; use the cue and explanation.
had he felt
Never had he felt so relieved before that day. (he / had / felt: inversion)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
did I notice
Only after checking did I notice the error. (I / did / notice: inversion)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
to accept
Were I to accept, I would need more information. (accept: inverted condition)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
need
Should you need help, contact reception. (need)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
to finish
The project is expected to finish next month. (finish)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
to have been lost
The documents appear to have been lost. (lose: earlier passive)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
stayed
I would rather you stayed here tonight. (stay: present preference)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
left
It is time we left. (leave: it is time pattern)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
having seen
She denied having seen the message earlier. (see: perfect gerund)
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
on
He insisted on checking the evidence himself.
Check the entire structure and intended meaning: inversion, passive reporting, perfect forms and clause links.
Write an original answer for each task. Review the guidance to check your work. These are self-review tasks, not automatic grammar grading.
Your wording can vary.
Put an appropriate auxiliary before the subject.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Use Had + subject + past participle in the condition.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Use the base verb after the subject.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Use is believed plus a suitable to-infinitive.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Use a perfect infinitive to mark the earlier time.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Use a past participle and keep essential time information.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Use an -ing phrase where it preserves meaning.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Ensure the main clause is complete and the reference is clear.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
Use a past form for that present preference pattern.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Your wording can vary.
The perfect infinitive places the believed state earlier than the reporting reference point.
Check both the form and the meaning. If you are unsure, compare the lesson explanation before marking this exercise reviewed.
Learn when shortening a clause preserves its meaning.
Choose the time you have. These are suggested study plans, not timers.
Answer the ten-question quiz. Read the explanation for each mistake before trying again.
Take the scored quiz →30 MINComplete the warm-up, then sets 2 and 3. Compare your answers and correct the patterns you missed.
Open sentence practice →60 MINWork through all four sets. Spend the final part writing, comparing and improving your own sentences.
Explore all four sets →Open the question that matches where you got stuck.
No. These ten extension questions review clause reduction, punctuation, verb patterns, linking words and conditional inversion. Use the explanations to choose a deeper topic lesson; a full C1 course would cover much more.
Review any unfinished challenges, revisit mistakes or choose another path. There is no need to repeat a perfect score.
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