Line Graphs

Your mission

Show the reader what changed—and what mattered

In IELTS Academic Writing Task 1, you may receive a graph, chart, table or diagram. For a line graph, the horizontal axis usually shows time and the vertical axis shows a value. One line may track a single subject. Several lines may compare countries, products, age groups or other categories. Your task is to summarise the visual information in your own words, select and report the main features, and make comparisons where they are relevant.

Official IELTS information says you should write at least 150 words and spend about 20 minutes on Task 1. Your answer must be connected prose, not notes or bullet points. It is assessed for Task Achievement, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy. This means the examiner cares about what you select, how you organise it and how accurately you express it—not simply how many trend words you know.

The most important word in the instruction is summarise. A graph might contain twenty-five plotted values, but a good report does not need twenty-five separate statements. It identifies the big picture and supports it with a sensible selection of figures. Imagine you are explaining the graph to a friend who cannot see it. What would they need to understand the shape of the data? That is your mission.

You also need to respect the unit. A value of 60 might mean 60 people, 60%, $60 million or 60 tonnes. Read the title, axes, legend, dates and any footnotes before deciding what the graph says. Beautiful grammar cannot fix a report about the wrong measurement.

Read before you write

Your five-part graph dashboard

Do not begin by searching for synonyms. First, decode the visual. Write five tiny notes on your question paper or in the planning area. These notes prevent common mistakes and make the introduction almost effortless.

Suppose a graph is titled “Daily journeys by three forms of transport, 2000–2020.” The lines show rail, bus and bicycle journeys, while the vertical axis is measured in thousands. Your notes might be: city journeys / rail-bus-bike / thousands / 2000–2020 / past. Now you know that “20” means 20,000 journeys and that the main detail verbs should normally be in the past tense.

Look closely at the axis scale. If it begins at 90 rather than zero, a move from 94 to 98 may look dramatic even though the numerical change is small. Describe the numbers, not the angle alone. Also check whether the final part of a line is a projection. A dotted forecast line calls for language such as is expected to or is projected to; it should not be reported as a completed fact.

See the shape

Find the story hiding behind the dots

Start with the beginning and end of every line. This gives you the broad direction: upward, downward, stable or mixed. Then scan for events that change the story—a peak, a low point, a sharp movement, a long flat period, a reversal or a place where one line overtakes another.

Choose headlines, not a diary

A diary says, “In 2000 it was 20, in 2005 it was 24, in 2010 it was 29…” A headline says, “The figure rose steadily across the period.” The second sentence gives the reader a pattern. You can then use the starting and ending values to show the scale of that pattern. Intermediate data is useful when it marks a turning point or creates a comparison, but not simply because it exists.

For a graph with several lines, try giving each line a short label: steady rise, long decline, stable then surge, or wide fluctuation. Next, look for natural partners. Two lines that rise can be discussed together. Two lines that exchange positions belong in the same paragraph. A clear exception can be described after the main group. The graph decides the grouping; a memorised template does not.

The view from above

Write an overview that actually informs

The overview is the reader’s map. It should state the most important patterns, usually without detailed figures. Official IELTS teaching guidance recommends giving the main trends or patterns in one or two sentences and then using body paragraphs to present the supporting data. A conclusion is not required for Task 1; if your overview is not near the beginning, it can appear at the end, but making it clear and easy to find is essential.

A useful overview often combines two types of information. First, it tells us about movement: which series rose, fell, fluctuated or stayed broadly stable. Second, it tells us about relationships: which finished highest, which was overtaken, whether the gap widened, or whether the lines moved closer together. You do not need every category if two statements can capture the whole graph, but you must not ignore an important exception.

What if there is no simple rise or fall?

Some graphs move up and down repeatedly. In that case, describe the range, the degree of fluctuation, the highest or lowest point, and where the line ends compared with where it began. Other graphs show cycles, long stability followed by sudden change, or lines that converge at the end. The overview should reflect the visual you have, not a sentence you memorised for an upward trend.

Keep figures out of the overview unless one number is necessary to express the main feature. “X was consistently the highest” is normally clearer than listing its value at four dates. Save representative numbers for the body, where they can prove the overview.

Evidence room

Choose numbers that earn their place

Every figure should answer a question. Does it show the starting gap? Prove the scale of a rise? Mark a peak? Confirm where two lines crossed? Establish the final ranking? If a number does none of these, it may be clutter.

Notice how the numbers work inside a statement about change and relationship. A crowded alternative—20 in 2000, 25 in 2005, 31 in 2010, 38 in 2015 and 45 in 2020—forces the reader to discover the pattern alone. Select the starting value, ending value and perhaps the crossover because those are the figures that explain the story.

Use approximation honestly. If a point sits near 48, write about 48, approximately 48 or just under 50. Do not invent 48.3 when the graph cannot support that precision. Preserve the unit and avoid repeating it awkwardly after every value; establish it clearly, then use the figure, the proportion or the category name where the reference is obvious.

Two reliable ways to organise body paragraphs

Group by relationship: put lines with similar movements together, or place two lines that cross in one paragraph. This is often effective for multi-line graphs because comparison becomes natural. Group by time: describe an early phase and a later phase when several lines change direction around the same date. This can work well when the graph has a clear turning point. Avoid switching between these systems without a reason, because the reader may lose track.

There is no need to give every line the same number of words. The line with a dramatic reversal may deserve more attention than one that remains almost unchanged. Fair coverage means representing the important information accurately, not writing one mechanical sentence per category.

Language controls

Describe movement without making it bigger

Trend language has two jobs: name the direction and show the size or speed accurately. A small rise should not “rocket,” and a line that moves up and down should not be called stable. Clear everyday academic words are enough.

The small grammar that protects accuracy

To gives the new level: the rate rose to 60. By gives the size of the change: it rose by 20, from 40 to 60. At gives a level: it stood at 60. From…to… gives both endpoints. Mixing these prepositions can change the data even when the trend verb is correct.

Use past tense for a finished historical period: the figure fell. Use present tense to introduce the visual: the graph compares. For forecasts, use language that keeps the uncertainty: is predicted to rise or is projected to reach. If the graph includes both recorded and forecast data, make the change in time clear.

Vary grammar as well as vocabulary. “Rail use increased sharply” uses a verb and adverb. “There was a sharp increase in rail use” uses a noun phrase. Both are useful, but the grammar around the word must change. Do not write “there was an increase sharply.” You can also compare rates: “Cycling grew more gradually than rail travel.”

Worked control-room example

From visual signals to a complete report

Consider this invented practice graph. It shows daily journeys, in thousands, made by rail, bus and bicycle in one city from 2000 to 2020. Rail rises from 20 to 45. Bus falls from 42 to 25. Bicycle use grows from 10 to 24, with faster growth after 2010.

First, decide what deserves attention

The biggest story is the reversal between rail and bus travel. Rail starts at less than half the bus figure but becomes the leading mode. Bicycle use also rises and ends close to buses. These are overview ideas. The start and end values, together with the approximate crossover, can support them in the body.

Next, choose the paragraph logic

Rail and buses belong together because they move in opposite directions and exchange rank. Bicycle use can form the focus of the second detail paragraph, with a final comparison to buses. This grouping gives the reader relationships rather than three disconnected timelines.

The introduction identifies the subject, unit and period. The overview states direction and final relationships without filling the sentence with data. The first body paragraph develops the central reversal; the second deals with the smaller series and connects it to the final bus value. No sentence invents a cause for the change.

Repair desk

Fix the mistakes that hide the graph’s story

Another common weakness is vague referencing. If you write “it increased” after mentioning three categories, the reader may not know what it means. Repeat the category or use a precise reference such as the rail figure. Clarity is more important than avoiding every repeated word.

Check comparisons carefully. Twice as high as, double, the majority and the highest have exact meanings. If the final values are 24 and 25, they are almost equal; one is not “far higher.” If three lines finish at 40, 50 and 60, the middle line is not the highest even if it rose the fastest. Direction, level and speed are different ideas.

Your practice route

Build confidence one decision at a time

Do not begin by writing a full report every day. Separate the skills. On one day, spend five minutes identifying overview features from three graphs. On another, practise grouping several lines. Next, write six accurate sentences using from, to, by and at. Then bring the skills together in a timed response.

A practical 20-minute routine is about three minutes for analysis and planning, fourteen minutes for writing, and three minutes for checking. This is teaching advice, not an official fixed rule. Adjust it during practice, but protect your planning time. Starting thirty seconds earlier does not help if you misunderstand the scale or miss the main reversal.

During the final check, underline your overview. Circle each number and ask what claim it supports. Check every occurrence of to and by. Confirm that your past and forecast verbs match the dates. Finally, look for one sentence that gives an opinion or cause; if the visual does not support it, remove it.

• I identified the subject, series, unit and period.
• I described the big picture rather than every point.
• My overview names real trends and comparisons.
• My paragraphs group data logically.
• Each selected figure supports an important feature.
• I used approximate language when values were not exact.
• My trend words match the size and direction of change.
• I used from, to, by and at accurately.
• I did not add opinions, causes or recommendations.
• My answer contains at least 150 words of connected text.