Vocabulary expansion — từ passive recognition đến active production

Passive vs active vocabulary

Passive vocabulary

Words you RECOGNIZE when reading/listening. Don't actively use.

Most adult learners have:

• Passive: 8,000-15,000 words
• Active: 2,000-4,000 words

Active vocabulary

Words you USE in speaking/writing naturally.

Band 7 = ~3,000 active words. Band 8 = ~5,000 active words. Band 9 = ~8,000+ active words.

The gap problem

Many candidates know "ubiquitous" passively (recognize in text) but never USE it.

Result: writing/speaking limited to small active vocabulary, even though they UNDERSTAND much more.

Converting passive → active

Method 1: Production within 24 hours

When you learn new word:

• Write 3 sentences using it (same day)
• Speak 1 sentence using it (same day)
• Re-use within 3 days in writing/speaking

Unused words sink back to passive.

Method 2: Topic clustering

Learn words in clusters around topics:

Climate change cluster (8 words):

• emissions, carbon footprint, mitigate, sustainable
• renewable, deforestation, accelerate, irreversible

Learned together = used together in essay.

Method 3: Collocations not just words

Word alone: "effective" Collocations: "highly effective", "prove effective", "effective solution"

Learning collocations = ready to deploy in real sentences.

Method 4: Spaced repetition

Review new word at:

• Day 1: introduced
• Day 2: review
• Day 4: review
• Day 7: review
• Day 14: review
• Day 30: review

After 6 reviews → typically in long-term memory + active.

Method 5: Use in CONTEXT

Don't memorize word list: "ameliorate = improve"

Instead: "The policy seeks to ameliorate the worst effects of poverty."

Context = anchor for memory + future use.

Common vocabulary mistakes

Mistake 1: Studying word lists without practice

Memorizing 50 words/day from list → most forgotten in 1 week.

Fix: 5-10 words/day with sentence creation + spaced review.

Mistake 2: Learning rare words first

"Plethora", "surreptitiously", "ostensibly" — sound impressive but rare in IELTS.

Fix: Master frequent vocabulary first. Coxhead's AWL = best resource.