Short answer: Describe a line graph in four paragraphs: paraphrase the question, write a no-numbers overview naming the overall trends, then split the detail into two body paragraphs grouped by time period or by line.
Select only the key figures — start and end points, peaks, lows and crossovers — and report them in the correct tense.
The line graph is the single most common visual in Academic Task 1, and the one where candidates most often write too much. Faced with twenty data points, they describe all twenty — and the answer sinks into a mechanical list.
This guide is the line-graph deep dive that sits under our general pillar on describing graphs and charts. That post covers every visual type at a glance; this one covers only line graphs, in the depth a Band 7 answer actually needs.
How do you describe a line graph in IELTS Writing Task 1?
A line graph shows how one or more variables change over time. Your job is not to transcribe it — it is to summarise it: identify the main trends, compare the lines where a comparison is meaningful, and support the summary with a small number of well-chosen figures.
That word "summarise" comes straight from the task instruction, and the examiner marks you on it. Task Achievement rewards an answer that selects and reports the main features; it penalises one that "recounts detail mechanically". Reading every point off the graph is the fastest route to a Band 5.
Before you write, spend two minutes reading the graph itself. Check the axes and units, note where each line starts and finishes, and circle anything dramatic: a peak, a sudden dip, a point where two lines cross. Those circled moments are your report.
What is the best structure for a line graph answer?
Use the same four-paragraph plan every time. It never changes with the topic, which means you can rehearse it until it is automatic and spend your exam minutes on the data instead of the architecture.
| Paragraph | Job | Length |
|---|---|---|
| 1 — Introduction | Paraphrase the question: what is measured, where, and over what period | 1 sentence |
| 2 — Overview | The overall direction of each line and the biggest contrast, with no figures | 1–2 sentences |
| 3 — Body 1 | First group of detail (e.g. the first half of the period, or lines that rose) | 3–4 sentences |
| 4 — Body 2 | Second group of detail (the later period, or lines that fell) | 3–4 sentences |
The decision that separates organised answers from muddled ones is how you split the two body paragraphs. There are two reliable options: split by time (early period in Body 1, later period in Body 2) or split by line (rising lines together, falling lines together).
Split by time when all the lines change behaviour around the same point — a shared turning point makes a natural chapter break. Split by line when the lines behave differently throughout, so that each paragraph carries one coherent story.
Whichever split you choose, the overview comes first and carries the most weight. If overviews are still costing you marks, our dedicated guide to the Task 1 overview sentence covers that single skill in full.
What vocabulary do you need for line graph trends?
Line graphs are described with a small, learnable set of trend verbs and modifiers. You need language for movement up, movement down, stability and fluctuation — plus adverbs that grade how big or how fast the change was.
| Direction | Verbs | Example sentence |
|---|---|---|
| Up | rise, increase, climb, grow | Access climbed steadily from 45% to 70%. |
| Down | fall, decline, drop, decrease | The rate fell sharply after 2012. |
| No change | remain stable, level off, plateau | The figure levelled off at around 90%. |
| Up and down | fluctuate, be erratic | Prices fluctuated between $3 and $5. |
| High/low points | peak at, reach a high of, bottom out at | Unemployment peaked at 12% in 2012. |
Get the small prepositions right, because examiners check them: figures rise to a level, by an amount, and stand at a point. "Increased to 70%" and "increased by 25 percentage points" describe the same movement two different ways.
This is only the core set — our full Task 1 trend vocabulary reference extends it with noun forms, speed and degree adverbs, and approximation language.
Band 7 line graph model answer (annotated)
The task below was written for this article as a teaching example in the exam's style — it is not a real or predicted question. "The line graph shows the percentage of households with internet access in France, Germany and Poland between 2004 and 2024."
Model answer (175 words):
The line graph compares the proportion of homes with an internet connection in France, Germany and Poland over a twenty-year period from 2004 to 2024.
Overall, access rose substantially in all three countries, with the gap between them narrowing sharply. Germany began and ended as the leader, while Poland, initially far behind, recorded the fastest growth.
In 2004, around 60% of German households were online, compared with roughly 45% in France and just 25% in Poland. Over the following decade, all three figures climbed steadily: Poland's share doubled to 50% by 2014, while France reached about 70% and Germany 80%.
Between 2014 and 2024, growth slowed as the markets approached saturation. Germany's figure edged up to 95%, and France's rose to slightly above 90%. Poland continued its rapid rise, reaching 88% in the final year — meaning the difference between the highest and lowest countries shrank from 35 percentage points to just seven.
Why it works. Paragraph one paraphrases the prompt — "percentage of households" becomes "proportion of homes", and the period is reworded. Nothing is copied.
Paragraph two is a clean overview: the shared upward trend, the narrowing gap, and the leader and fastest grower — with no numbers at all.
The body paragraphs split the timeline at 2014, the natural turning point where growth slows. Each selects a handful of figures and constantly compares countries rather than listing them one by one. The final sentence quantifies the "narrowing gap" claimed in the overview, tying the report together.
What mistakes lose marks on line graph questions?
The same handful of errors appears in almost every underperforming line-graph answer. All of them are avoidable with the structure above.
The most damaging is describing every data point. "In 2004 it was 25%, in 2005 it was 27%, in 2006 it was 30%..." shows no selection, and Task Achievement is scored on selection. Report movements, not years.
Next is the missing or buried overview — the error that caps more Task 1 scores than any other. Wrong tense is a close third: past periods need the past simple, and a period running to the present needs the present perfect ("has risen since 2020").
Finally, never speculate. The graph does not tell you why internet access grew, and guessing ("because smartphones became popular") is off-task in Task 1. Describe what the data shows and stop there. For the full list of these traps across every visual type, see our common Task 1 mistakes guide.
How do you practise line graph answers effectively?
Write timed, 20-minute answers — but do not stop at writing them. The improvement comes from measuring each attempt against the four criteria and fixing one weakness at a time.
Paste each answer into the IELTS Writing Checker and it grades against the official descriptors, flagging a weak overview, ungrouped data or repetitive trend verbs the way an examiner would. Two or three checked answers a week gives you a visible trend line of your own: your Task Achievement score, moving up.
Pair that with reading strong models — the annotated answer above and the band-scored sample essays — and the structure stops being a checklist and starts being a habit.