IELTS line graph Task 1: structure and Band 9 model

The line graph is the most common figure in Academic Writing Task 1, and the one where most reports lose marks in the same place: the writer reads the graph out point by point, 2000 then 2001 then 2002, and never says what the whole thing shows. That report can be accurate to the last figure and still cap at Band 5 on Task Achievement, because the one sentence that matters, the overview, is missing.

This is a guide to the line graph specifically: how to build the four-paragraph report, what the overview has to capture, the trend vocabulary and grammar that carry it, and a Band 9 model with the reasons it scores. It sits under the Writing Task 1 guide and the seven chart types; here we go deep on this one.

What a line graph asks

A line graph shows change over time. One or more lines move across a time axis, and your job is to describe how they move and how they compare, in about 150 to 180 words. Not every wiggle. The movement that matters.

The report has four parts, and the shape never changes: an introduction that paraphrases the title, an overview that names the big picture, and two body paragraphs that give the detail with figures. Aim for 20 minutes, because Task 2 is worth twice as much and needs the other 40. The whole thing is one of four axes the examiner marks, but on a line graph, one axis decides more than the rest.

The overview is the whole game

Write the overview or accept a Band 5. That is not an exaggeration; it is how the descriptor is built. The Academic Task Achievement descriptor first mentions an overview at Band 6, "a relevant overview is attempted," and at Band 5 it describes exactly the report without one: "there may be a tendency to focus on details" without referring to the bigger picture. No overview, no Band 6 on Task Achievement, however clean the rest.

So what goes in it? Two sentences, usually, opening with "Overall." Name the general direction of each line across the whole period, which line ended highest or lowest, and the single biggest change. No numbers here; the figures belong in the body. For a graph of museum, theme-park and historic-house visitors, an overview reads: "Overall, visits to museums and theme parks both rose over the period, while visits to historic houses fell steadily. By 2020, theme parks had become the most visited of the three." That is the examiner's first Band 6 checkpoint, cleared in two sentences.

Select the key features, don't describe every point

The Band 8 Task Achievement line reads "key features are skilfully selected," and the word doing the work is selected. A line graph often carries thirty data points. You are not meant to report thirty. You are meant to pick the handful that carry the story, group them, and support them with a few figures.

Grouping is how you select. Put lines that move the same way together, and split your two body paragraphs by trend rather than by line. If two lines rise and one falls, one paragraph takes the risers and one takes the faller, instead of a paragraph per line read top to bottom. Then support each claim with one or two numbers, not the full series. A report that names the starting value, the peak, and the end value has selected; a report that lists every year has not, and it reads flat because nothing stands out. This is a coherence and cohesion decision as much as a content one: grouping is what gives the body its logical order.

The four paragraphs

• Introduction. One sentence. Paraphrase the title of the graph in your own words, including what is measured, the units, and the time span. Do not copy the prompt wording; a copied sentence earns nothing.
• Overview. One or two sentences, starting "Overall," naming the main trends and the standout comparison. No specific figures.
• Body paragraph one. The first group of lines, described with a few supporting numbers.
• Body paragraph two. The second group, built the same way.

Tense follows the graph. A finished period is past simple: rose, fell, peaked. If the graph runs to the present or includes a projection into the future, you shift to present perfect or future forms for that part. Getting the tense wrong is a grammar error the examiner marks even when the description reads fluently.

Trend vocabulary, and the grammar that carries it

A line graph is where Lexical Resource shows on the page, because half your words describe movement. Repeat "went up" five times and the range looks thin. The fix is a small, controlled set, not a thesaurus raid.

Movement up: rose, climbed, increased, grew, surged (for a steep one). Down: fell, dropped, declined, decreased, plummeted (for a steep one). Flat: levelled off, plateaued, remained stable, held steady. Unsteady: fluctuated, wavered.

The grammar point most guides skip is that each movement can be said two ways, and using both is what shows range. There is the verb-plus-adverb form, "sales rose sharply," and the noun-plus-adjective form, "there was a sharp rise in sales." Same fact, two structures, and alternating them across the report is a clean way to hit the "variety of complex structures" the Band 7 grammar line wants. Pair each with the right degree word: sharply, steeply and dramatically for big moves; steadily and gradually for slow ones; slightly and marginally for small ones. One caution from the descriptor itself: reaching for rarer words without control adds "inaccuracy or inappropriacy," which the Band 6 vocabulary line penalises. Precise ordinary words beat showy wrong ones.

Comparing more than one line

Most line graphs give you two to four lines, and the comparison is half the task. Say which line sits highest and lowest overall, and mark the moments they cross. A crossover is a key feature almost by definition: "theme-park visits overtook museum visits around 2010" is exactly the kind of selected detail Band 8 rewards. Note where lines move together and where they split apart. What you avoid is describing each line in full isolation, one after another, because that hides the comparison the graph was drawn to show.

Task Achievement, band by band

The line graph lives or dies on Task Achievement, so read what the descriptor asks. At Band 7, the Academic response "presents a clear overview, the data are appropriately categorised, and main trends or differences are identified": overview present, lines grouped, key movements named. At Band 6, only "a relevant overview is attempted," and the categorisation is looser. At Band 5, "there may be a tendency to focus on details" without the bigger picture, which is the point-by-point report with no overview. The gap from 5 to 7 is almost entirely the overview and the grouping, not the vocabulary.

A Band 9 model, and why it works

Take a common prompt: "The graph below shows the number of visitors, in millions, to three types of tourist attraction in one country from 2000 to 2020."

The line graph compares how many people, in millions, visited museums, theme parks and historic houses in one country over a twenty-year period from 2000 to 2020.

Overall, visits to both museums and theme parks increased over the period, whereas visits to historic houses declined steadily. By the end, theme parks had become the most popular of the three attractions, having overtaken museums in the second half of the period.

In 2000, museums were the most visited attraction at roughly 8 million, and they climbed gradually to about 14 million by 2020. Theme parks started lower, at around 6 million, but rose far more sharply, and by 2010 they had drawn level with museums at approximately 11 million before continuing upward to 18 million, the highest figure on the graph.

Historic houses followed the opposite path. Beginning at about 7 million in 2000, higher than theme parks at that point, they were in a slow but steady decline, dropping to roughly 5 million by 2020 and ending as the least visited of the three.

Read what the report does. The introduction paraphrases the prompt, changing "shows the number of visitors" into "compares how many people visited," rather than copying it. The overview names the two rising lines, the one falling line, and the crossover, all without a single figure. The two body paragraphs group by trend, the risers together and the faller alone, and each supports its claim with a start value, a turning point and an end value rather than every year. The crossover around 2010 is stated outright, because it is a key feature. Around 170 words, mostly past simple, with past perfect ("had become," "had drawn level") marking the end-state and the crossover, and both trend grammar forms in play ("climbed gradually" and "in a slow but steady decline").

The mistakes that cap you

A few faults account for most stalled line-graph reports, and the first two are the expensive ones.

No overview is the Band 5 trap, already covered: a report that starts describing data straight after the introduction has skipped the one sentence Task Achievement needs most. Describing every data point is its close cousin, a body that reads out each year for each line, which the "focus on details" line marks down. Then the wrong tense, present simple on a finished period or past on a projection, which the grammar criterion catches. The thesaurus reach is quieter, swapping "rose" for a rare verb used slightly wrong, which the Band 6 vocabulary line penalises rather than rewards. And an introduction copied word for word from the prompt earns nothing toward your count, so those words are wasted.

Drill it in five minutes

A full report takes 20 minutes and days to mark. The two parts that decide your Task Achievement, the overview and the grouping, train in far less.

• The overview drill. Take one line graph and write only the overview, two sentences starting "Overall," no figures. If you can't name the big picture without numbers, you're reading detail, not trends.
• The grouping drill. For a multi-line graph, sort the lines into "moves up," "moves down," "flat" before writing. That sort is your two body paragraphs.
• The two-forms drill. Take one movement and write it both ways: "X rose sharply" and "there was a sharp rise in X." Alternating the two is what shows grammatical range.

That's the idea behind IELTS Drills. Feedback comes back tagged to a single Band Descriptor, so when a Task 1 report lands at 6.5 you can see whether the half-band went on a missing overview, weak grouping, or the trend grammar, and drill that one in five minutes a day.

Frequently asked questions

How long should an IELTS line graph answer be? At least 150 words, with 160 to 190 the comfortable range. Under 150 costs you directly on Task Achievement, and much over 190 usually means you're describing detail you should have selected out.

Where does the overview go, and what's in it? Right after the introduction. It names the overall trend of each line and the standout comparison, in one or two sentences, with no specific figures. Without it, Task Achievement caps at Band 5.

What tense should I use? Past simple for a finished period. If the graph reaches the present, present perfect fits; if it projects into the future, use future forms (will rise, is expected to fall) for that part.

Do I need to mention every number? No. Select a few figures that support each key feature, a start value, a peak, an end value. Listing every point flattens the report and works against the "key features selected" the higher bands reward.

How do I describe several lines at once? Group them by how they move, put similar trends in the same body paragraph, and name where lines cross or diverge. The crossovers are usually key features worth stating directly.

The bottom line

An IELTS line graph is won in two moves: an overview that names the big picture without figures, and body paragraphs that group the lines by trend and support each with a few selected numbers. Get those right and Task Achievement clears Band 6, then the trend vocabulary and the two grammar forms lift the other axes. Skip the overview and no amount of accurate detail rescues the score. For the other six figures and how they change the overview, the chart-types guide has the map, alongside the bar chart, pie chart, map, process diagram, table and combination deep dives; here, the whole game was the trend and the overview. With IELTS Drills, the feedback tells you which axis is still costing you the 0.5, five minutes a day.