Short answer: Task 1 trend vocabulary covers five situations — up, down, stable, fluctuating, and extremes — each with verb and noun forms you can grade with adverbs like sharply or gradually. Learn the reference table below, get the prepositions right (to, by, from, at), and rotate forms rather than repeating one verb.
Lexical Resource is a quarter of your Task 1 score, and Task 1 is the rare part of IELTS where the required vocabulary is a closed set. The same fifty-odd words describe every line graph ever set.
This post is that set, organised for learning: the master table, the modifiers, the prepositions, and the noun-form trick — then an annotated model showing the language deployed. It supports all our chart-specific guides, from line graphs to mixed charts.
What vocabulary do you need to describe trends in IELTS Task 1?
Five families cover everything: upward movement, downward movement, stability, fluctuation, and turning points or extremes. Here is the master reference — verb forms, noun forms, and the register notes examiners care about.
| Meaning | Verbs | Nouns | Notes |
|---|---|---|---|
| Go up (neutral) | rise, increase, grow, climb | a rise, an increase, growth | The safe core — accurate everywhere |
| Go up (large/fast) | surge, soar, jump, shoot up, rocket | a surge, a jump, a leap | Only for genuinely dramatic changes |
| Go up (small/slow) | edge up, inch up, creep up | a slight rise, a modest increase | Good for near-flat growth |
| Go down (neutral) | fall, decrease, decline, drop | a fall, a decrease, a decline, a drop | The safe core |
| Go down (large/fast) | plunge, plummet, slump, halve | a plunge, a slump, a collapse | Reserve for steep falls |
| Go down (small/slow) | dip, slip, edge down | a dip, a slight fall | A dip implies recovery afterwards |
| Stay the same | remain stable/steady, level off, plateau, stagnate | a plateau, stability | "Level off" = flat after movement |
| Up and down | fluctuate, oscillate, be volatile | fluctuation, volatility | Needs a range: "between X and Y" |
| High point | peak at, reach a high of, top out at | a peak, a high | "Peak" is verb and noun |
| Low point | bottom out at, fall to a low of | a trough, a low | "Trough" pairs with "peak" |
| Recover / reverse | recover, rebound, rally; the trend reversed | a recovery, a rebound, a reversal | For direction changes |
| Multiply | double, treble/triple, halve; rise threefold | a doubling, a threefold increase | Compact and precise — use them |
Two register warnings. "Skyrocket" and "nosedive" read as journalistic — prefer surge and plunge. And intensity must match the data: calling a 3% rise a surge is an accuracy error dressed as vocabulary. When in doubt, take the neutral verb and let an adverb carry the drama.
How do you say increase and decrease in different ways?
The highest-value trick in Task 1 is alternating verb and noun forms. Every trend sentence has two available grammars, and switching between them varies both your vocabulary and your sentence structures at once.
Verb form: "Sales rose sharply between 2010 and 2014." Noun form: "The period from 2010 to 2014 saw a sharp rise in sales." Same fact, different subject, different rhythm.
The noun form takes a small set of support verbs: a period saw / witnessed / experienced a rise; there was a fall. Aim to cast a third of your trend sentences in noun form — it is the single easiest Grammatical Range win in the report.
Which adverbs and adjectives grade the change?
Bare verbs say the direction; modifiers say the size and speed. Examiners read them as precision, provided they match the data.
| Scale | Adverbs (with verbs) | Adjectives (with nouns) |
|---|---|---|
| Large | sharply, steeply, dramatically, considerably, substantially | a sharp / steep / dramatic / substantial rise |
| Medium | markedly, noticeably, significantly | a marked / noticeable / significant fall |
| Small | slightly, marginally, modestly | a slight / marginal / modest increase |
| Steady pace | steadily, gradually, consistently | a steady / gradual / consistent decline |
| Fast pace | rapidly, quickly, swiftly | a rapid / swift recovery |
Approximation language belongs in the same kit: roughly, around, approximately, just under, just over, nearly, slightly more than. Reading "about 58%" off a gridline as "approximately 60%" is accurate; inventing "58.3%" is not.
Which prepositions go with trend verbs?
Prepositions are where accurate vocabulary quietly turns into grammar errors. Four rules cover nearly every case.
Rise or fall to the level reached: "increased to 70%". Rise or fall by the size of the change: "fell by 12 percentage points". Movement runs from the start to the end: "climbed from 45% to 70%". A static figure stands at: "remained at 5%".
Add the noun-form pairings — "a rise of 12%" (size) and "a rise in unemployment" (the thing measured) — and you have the full set. Mixing up "of" and "in" here is among the most common preposition slips in Task 1 scripts.
Annotated model: the vocabulary in action
The task below was written for this article as a teaching example in the exam's style — not a real or predicted question. "The line graph shows the unemployment rate in one European country between 2008 and 2024."
Model answer (174 words):
The line graph shows how the unemployment rate in one European country changed over the sixteen years from 2008 to 2024.
Overall, unemployment climbed steeply in the early years, then fell back over the rest of the period, ending below its starting level despite a brief interruption in 2020.
In 2008 the rate stood at 6%. It then rose sharply, surging to a peak of 12% in 2012 as the downturn shown on the graph took hold — double the starting figure, and the highest point in the period.
From 2012 onwards the trend reversed. The rate declined steadily for eight years, dipping to 5% by early 2020. There was then a brief jump to 8% during that year, before the figure resumed its downward path. By 2024, unemployment had dropped to 4.5%, the lowest level shown — a fall of seven and a half percentage points from the 2012 peak.
Why it works. Count the range: climbed, surged, peaked, reversed, declined, dipped, jumped, resumed, dropped — nine distinct movements, none repeated, each matched to the size of the change it describes.
Both grammars appear: verb form ("rose sharply") and noun form ("There was then a brief jump"). The prepositions are exact throughout — stood at, to a peak of, a fall of.
And the intensity is honest: "surging" for a doubling, "dipping" for a small fall that later recovers, "brief jump" for a one-year spike. Range serving accuracy — that is the Band 7+ combination.
How do you learn this vocabulary without misusing it?
Learn it in pairs and sentences, never as bare word lists: "surge = big fast rise — prices surged to a peak of $5.20". The example sentence carries the preposition and the intensity with it.
Then test it under exam conditions and measure the result. The IELTS Writing Checker scores Lexical Resource against the official descriptors and flags both repetition and misused intensity — the two failure modes of trend vocabulary — so each practice report tells you which words are actually earned.
Fold that into the weekly routine in our writing improvement guide, and the closed set above stops being a list and becomes reflex.