Cambridge Use of English · Part 3
Word Formation: A System, Not a Vocabulary List
Most students prepare for Use of English Part 3 by reading hundreds of pages of alphabetical word families. Under exam pressure, that passive recognition evaporates. To guarantee high marks on Cambridge B2 First, C1 Advanced, and C2 Proficiency, you need a systematic four-step diagnostic protocol.
The Structure of Part 3
In Part 3, you are given a short authentic text with eight numbered gaps. Next to each gap is a capitalised root word (e.g. DESTROY, CARE, APPROVE). Your objective is to derive the appropriate morphological form that fits both grammatically and semantically into the sentence.
The 4-Step Diagnostic Protocol
Whenever your eyes land on a gap, run this 10-second mental audit before you write a single letter:
Determine the Syntactic Slot (Part of Speech)
Inspect the immediate grammatical neighbourhood of the gap:
- • After possessives, articles, or adjectives? → Noun needed (the sudden [LOSS] of revenue).
- • Preceding a noun, or following linking verbs (seem, become, remain)? → Adjective needed.
- • Modifying an adjective, verb, or starting an entire clause? → Adverb needed ([PREDICTABLY], the meeting ran late).
- • Following modal auxiliaries or subject pronouns? → Verb needed (we must [STRENGTHEN] our ties).
Check the Semantic Polarity (Positive vs Negative)
This is where 40% of candidates lose marks. Even if you correctly identify that an adjective is required, does the sentence meaning demand a negative prefix? Look for contextual warning words like failed, unable, despite, regrettably, few, seldom.
Example: “Despite extensive testing, the device proved remarkably [RELY].” → unreliable, NOT reliable!
Check Number & Person (Singular vs Plural)
If the gap requires a noun, does it agree with plural verbs or determiners like these, several, numerous? An answer like expectation when the sentence says “their highest ______ were exceeded” receives zero marks. The correct form is expectations.
Audit Orthography & Spelling Rules
Check the spelling mechanics:
- • Dropping the final silent e before vowel suffixes (argue → argument, admire → admirable).
- • Changing y to i (rely → reliable, day → daily).
- • Consonant doubling on stressed short vowels (occur → occurrence).
The "Double-Shift" Trap
At C1 and C2 levels, Cambridge frequently introduces root words that demand two simultaneous transformations: both an affix change AND a prefix shift. For example:
| Root | Common Incomplete Answer | Full Exam Transformation (Prefix + Suffix) |
|---|---|---|
| APPROVE | approval | disapproval |
| SATISFY | satisfied | dissatisfied / dissatisfaction |
| CARE | carefully | carelessly |
| LEAD | leading | misleading |
Interactive Practice: 4 Classic Exam Challenges
1. Her ______ to admit defeat inspired the whole squad. [REFUSE] See answer
Answer: refusal
Diagnostic: Follows possessive pronoun “Her” → Noun required. Root refuse + noun suffix -al.
2. The company announced a series of ______ measures to cut costs. [PRECEDE] See answer
Answer: unprecedented
Diagnostic: Modifies noun “measures” → Adjective required. Meaning denotes something never seen before → Negative prefix un- + root + suffix -ed.
3. We must ______ the bridge before heavy winter storms arrive. [STRONG] See answer
Answer: strengthen
Diagnostic: Follows modal verb “must” → Base verb required. Root strong → noun strength → verb strengthen.
Test your recall in The Formation Factory
Race against the conveyor belt! Type the correct noun, adverb, or negative adjective before the root word drops into the furnace.