Help the exhausted grad student finish her thesis statement without sounding completely informal. Select the most natural academic collocation.
The professor's new theory on time travel is _____, sparking heated debates and minor shouting matches in the physics department.
The correct answer is highly controversial.
In academic discourse, the adverb "highly" strongly collocates with adjectives like "controversial," "probable," and "effective." We do not typically say "strongly" or "heavily" controversial.
Adjective and adverb
Adjective vs adverb: the most common mix-up in English description words. Both add detail, but they attach to different things — and picking the wrong one breaks the sentence.
Adjectives modify nouns: a slow car. Adverbs modify verbs, adjectives, or other adverbs: drove slowly, incredibly fast.
Diagnostic: ask what is being described? If it's a thing or person → adjective. If it's an action, quality, or degree → adverb. Watch linking verbs (feel, taste, look) — they take adjectives, not adverbs: it tastes good, not well.
Adverb
Adverb vs adjective: adjectives describe things; adverbs describe actions, qualities, or degrees. The mix-up usually happens after action verbs — she sings beautiful (wrong) vs she sings beautifully (right).
An adverb modifies a verb, adjective, or another adverb: incredibly fast, she spoke softly, we go often.
Diagnostic: ask what word is this describing? If it's a verb (an action) → adverb. If it's a noun (a thing) → adjective. Exception: linking verbs (be, seem, taste) take adjectives, not adverbs.
Adjective
Adjective vs adverb: both describe things, but adjectives attach to nouns while adverbs attach to verbs. A quick answer (adjective → noun) vs answered quickly (adverb → verb).
An adjective modifies a noun or pronoun — telling you what kind, which one, or how many: a red car, something useful, three heavy boxes.
Diagnostic test: if the word describes a thing or person, use the adjective form. If it describes an action, you need the adverb (-ly) form instead.
Collocations
Collocation vs idiom: both are fixed expressions, but collocations are transparent (you can guess the meaning from the words: heavy rain = a lot of rain), while idioms are opaque (kick the bucket ≠ literally kick anything). Collocations are about which words pair naturally; idioms are about hidden meaning.
Collocations are habitual word combinations: make a decision, strong coffee, take a shower. Grammar allows alternatives, but fluency demands the conventional pairing.
Diagnostic: if the meaning is clear but the combination sounds "off" to native ears (do a mistake instead of make a mistake) — it's a collocation issue.
Vocabulary for B2/Upper Intermediate
B2 vs C1 vocabulary: B2 gives you precision within common topics. C1 adds low-frequency academic/professional vocabulary and full register sensitivity — knowing that commence is formal, start neutral, kick off informal, and choosing appropriately. The jump is from "precise" to "stylistically aware."
B2 vocabulary = ~4,000–6,000 words. Hedging, reporting verbs, idioms, figurative language, register-appropriate synonyms.
Diagnostic: can you write a formal essay with appropriate hedging and varied vocabulary? Yes → B2. Does your formal writing still sound slightly informal or your informal writing oddly stiff? → need C1 register control.
B2 | Upper Intermediate
B2 vs C1: B2 means effective communication on complex topics with some effort. C1 means effortless fluency with precise register control. If you can argue a point but still reach for words and make structural slips under pressure, you're B2.
B2 is the upper-intermediate CEFR level: mixed conditionals, complex passives, reported speech with backshift, participle clauses, and sustained written argument.
Diagnostic: does your writing read as "competent non-native" or "could be native"? The former → B2. The latter → C1.
Medium
Medium vs Easy: Easy has one obviously correct answer and clearly wrong distractors. Medium has one correct answer but plausible distractors — you need to actually know the rule, not just guess from sound.
The Medium tag filters for A2–B1 challenges with realistic difficulty: one rule per question, plausible alternatives, everyday contexts.
Diagnostic: if you're scoring 90%+ on Easy, move here. If you're below 60% on Medium, go back to Easy for that topic. Target 70–80% accuracy for maximum learning.