Where it appears in the exam
What is it?
Reduced relative clauses are condensed relatives: instead of the people who are living nearby, English allows the people living nearby. The reduction works by removing both the relative pronoun (who/which/that) and the verb be at once, leaving a participle: -ing if the noun does the action (the woman speaking) or a past participle if it receives it (the documents signed). The natural instinct is to keep the whole relative clause with a full conjugated verb, so your first reaction is usually to write a longer structure than English needs.
Why it matters in the exam
In B2 First it's above all a recognition competency: the reading texts (Part 5, 6 and 7) are full of reduced participles, and reading them quickly saves you time. And in Part 4 you may be asked to condense a full clause without going over the word limit. If you don't recognise the reduction, you slip in unnecessary pronouns or verbs, create impossible hybrids like 'who living', or never reach the exact wording that scores.
The cognitive trap
"Your instinct keeps the whole relative clause: "the people who living nearby""
This is structural incompleteness: your brain has learned that a relative clause needs a pronoun (who/which/that), so it holds onto the pronoun even when it drops the verb be — producing the impossible hybrid "who living". The cognitive conflict is real: reduction asks you to delete two things at once (pronoun + be), not one.
"The people living nearby often walk to work."
English compresses who are living into the participle living. The instinct is to keep the full clause (the people who live nearby) or, worse, to build the impossible hybrid the people who living nearby, leaving the pronoun stranded without the verb be. The other instinct is using -ing where the noun receives the action and a past participle is needed.
Recognition pattern
In the exam, look for the key signal first. The answer follows.
Signals that make you look twice
"The woman who is speaking is my tutor." → "The woman speaking is my tutor."
"The files that were deleted cannot be recovered." → "The files deleted cannot be recovered."
"Anyone who is interested in volunteering should email us." → "Anyone interested in volunteering should email us."
"The car parked outside belongs to Anna." (= which is parked)
"The man who was arrested has been released." → "The man arrested has been released."
The errors that Cambridge exploits
"Students who living abroad often become more independent."
Cambridge penalises it because it's an impossible hybrid: you've kept the relative pronoun who but dropped the verb be. Either say 'who are living' (full) or 'living' (reduced), never 'who living'.
"Students living abroad often become more independent."
Correct: living reduces who are living and modifies students directly.
"The pictures taking during the trip were uploaded that evening."
Cambridge penalises it because taking suggests an active action, as if the pictures were taking something. The noun receives the action, so it needs the past participle: taken.
"The pictures taken during the trip were uploaded that evening."
Taken is a past participle and reduces which were taken: the pictures receive the action of taking.
"The man arresting last night has already been released."
Cambridge penalises it because the man doesn't arrest, he is arrested. The passive voice requires the past participle arrested, not the -ing.
"The man arrested last night has already been released."
Arrested reduces who was arrested; the phrase stays compact and the meaning is identical.
"Anyone is interested in the role should apply by Friday."
Cambridge penalises it because you've turned the noun's description into the main verb of the sentence, leaving 'Anyone is interested... should apply' with no coherent structure.
"Anyone interested in the role should apply by Friday."
Interested reduces who is interested and sounds completely natural in an exam context.
Why your brain gets it wrong
The learner's short circuit
Analyse the trap by exam format
The people who were invited to the event arrived early. → The people ______ to the event arrived early.
Because your instinct is to keep the whole relative clause, you reach for the full 'who were invited'. In Part 4 the goal is to condense it: who were invited compresses into the participle invited without changing the meaning.
who were invited
The noun people is already identified, and the part that follows only describes it passively.
→ invited
In Part 4 you must compress without losing meaning
The hard part isn't understanding the sentence, but spotting that Cambridge wants a version that is shorter but identical in meaning. If you copy the full clause, you don't make the real transformation and often go over the word limit.
Strategy
Look for sequences like who is/are + -ing or who was/were + participle. If they only describe the noun, try the reduction: students studying, items found.
Reading text: "The passengers waiting on the platform had no idea about the delay." Who didn't know about the delay?
Without the pronoun who is/are, a reader can lose sight of the fact that 'waiting' is a reduced relative (= who were waiting) and misread who does the action.
passengers waiting
Noun + -ing participle with no relative pronoun: it's a reduced relative describing passengers.
→ the passengers who were waiting on the platform
In reading, recognising the reduction is speed
In Part 5, 6 and 7 the texts use reduced participles constantly. You're not asked to produce them, but if you don't recognise them on the fly you lose track of who does what and re-read too much.
Strategy
When you see a noun followed by a participle (-ing or -ed) with no relative pronoun, mentally rebuild the who/which is + participle to lock in the meaning: the man standing = the man who is standing.
Reduced relative clauses is 1 of 82
The exam tests 82 grammar competencies across 19 families. Mastering one is the first step. Automating all 82 is passing.
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