Line graphs are a common IELTS Writing Task 1 question type. You may be given one graph or two related graphs with multiple lines that illustrate change over time.
The graph has two axes. The x-axis (horizontal) typically shows time, while the y-axis (vertical) shows the measurement, such as people, money, percentages or quantities. Read the title, labels, units and time period before selecting trends.
1.1 Objective
Your aim is to produce a formal or neutral report that selects, summarises and compares the main features. The official IELTS Academic Writing format says that Task 1 requires at least 150 words and should take about 20 minutes.
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Informal
More suitable for a report
The graph shows very big changes.
The graph shows major changes.
I can see that...
It is clear that... / It can be observed that...
Working on Writing? Use the IELTS course for structured preparation, or submit a finished answer for writing correction.
Select the key features instead of reporting every data point.
Identify overall upward, downward, stable or fluctuating trends.
Group lines or periods logically.
Compare relevant categories and support them with accurate figures.
Use appropriate tense, trend vocabulary and grammatical structures.
2. IELTS Task 1 Line Graph Questions
The time period may be entirely in the past, include the present, or extend from past data into a predicted future. The dates determine the tense and whether you need forecast language.
2.1 Line Graph in the Past
The graph gives information about the visitors to Cardiff and Dublin from 2010 to 2020.
Summarise the information by selecting and reporting the main features and make comparisons where relevant.
Write at least 150 words.
2.2 Line Graph from the Past to a Predicted Future
The graph gives information about the actual and predicted number of visitors to Cardiff and Dublin from 2018 to 2040.
Summarise the information by selecting and reporting the main features and make comparisons where relevant.
Write at least 150 words.
Use past tense for completed years and forecast language for future figures, such as is predicted to rise, is expected to remain stable or is projected to fall. Do not present a forecast as an established fact.
3. A Five-Step Method for IELTS Line Graph Task 1
Read the frame: note the title, axes, units, categories and years.
Find the big picture: mark the overall direction of each line, the highest and lowest points, crossings and major changes.
Choose two overview features: select the most important trends without adding a list of figures.
Group the details: organise similar lines together, contrast different lines, or divide a long period logically.
Write and check: use accurate data, comparisons and tense; then check names, numbers, units and word count.
Include
A paraphrased introduction
A clear overview
Selected figures for key features
Relevant comparisons
Accurate tense and units
Avoid
Describing every point mechanically
Giving reasons not shown by the graph
Listing numbers without comparisons
Adding opinions or a Task 2-style conclusion
Using dramatic words for small changes
4. Structure for Line Graph Task 1 Questions
A four-paragraph structure is reliable: introduction, overview and two main body paragraphs. It is a practical method, not a rule that every report must contain exactly four paragraphs. The same broad structure can be adapted for a bar chart, pie chart, table, map or process diagram.
4.1 Introduction
Paraphrase the task statement in one sentence. Keep the subject, categories, unit and time period accurate. You can change vocabulary, sentence structure or word class, but do not change the meaning.
The graph shows information about...
The line graph illustrates...
The graph compares...
The line charts provide data on...
Example of paraphrasing
Original: The graph gives information about visitors to Cardiff and Dublin from 2010 to 2020.
Paraphrase: The graph shows how many people visited Cardiff and Dublin over the ten-year period from 2010 to 2020.
4.2 Overview
The overview summarises the most noticeable features. A relevant overview is important for Task Achievement, as shown in the official IELTS Writing Task 1 band descriptors (PDF). It should usually identify two or three major trends, contrasts, crossings or extremes without listing every figure.
A useful pattern is: Overall, [main direction or contrast]. In addition, [second major feature].
Example: Overall, visitor numbers in Cardiff rose substantially, whereas Dublin experienced an overall decline. Cardiff overtook Dublin near the end of the period and finished with the higher figure.
You do not need a separate conclusion for Academic Task 1.
4.3 Main Body Paragraphs
Use the body paragraphs to develop the key features with selected data. Good grouping depends on the graph:
By line: describe Cardiff in one paragraph and Dublin in the other.
By similarity: group lines that rise together and contrast them with lines that fall.
By time: divide a long period at a meaningful turning point.
By importance: explain the dominant trends first, then secondary details.
5. IELTS Writing Task 1 Band Descriptors Explained
Writing Task 1 is assessed using four criteria. Use the complete IELTS Writing band descriptor guide together with the official descriptors.
Task Achievement
Select and clearly highlight the main trends, include a relevant overview and support key features with accurate figures.
Coherence and Cohesion
Arrange information logically, use paragraphs clearly and connect comparisons without mechanical over-linking.
Lexical Resource
Use accurate trend, degree and comparison vocabulary; avoid repetition and exaggerated word choice.
Grammatical Range and Accuracy
Control tense, articles, comparisons, clauses and complex structures while keeping errors limited.
6. Vocabulary for IELTS Line Graphs
Choose words that match the direction and size of the change. The goal is precise description, not the maximum number of synonyms. For a broader reference, use the IELTS Academic Task 1 vocabulary guide.
6.1 Language to Describe Trends
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Upward trend
Downward trend
Other trend
go up
decrease / a decrease
plateau
increase / an increase
decline / a decline
hit a low of
grow / growth
drop / a drop
bottom out
rise / a rise
fall / a fall
dip / a dip
climb
reduce / a reduction
fluctuate / fluctuation
peak at
plunge / plummet
remain steady / stable / unchanged
reach a high of
hit a low of
level off
Accuracy note:peak at must be followed by a value; peak in is followed by a year or period. Use fluctuate only when the line moves up and down more than once.
6.2 Verbs and Adverbs to Describe Change
A verb + adverb can describe both direction and degree. Use past simple for completed historical data and an appropriate future form for predictions.
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Verb
Adverb
Example
decline
considerably
Visitor numbers declined considerably.
fall
sharply
The figure fell sharply after 2015.
increase
dramatically
The total increased dramatically between 2011 and 2014.
decrease
slightly
The number decreased slightly in 2015.
grow
steadily
Attendance grew steadily from 2018 to 2020.
rise
gradually
The figure rose gradually over the period.
go up
rapidly
The total went up rapidly after 2017.
Words such as plunge, plummet, rocket, soar and surge already imply a large change. Do not pair them with an adverb that repeats the same meaning, and do not use them for a small movement.
6.3 Adjectives and Nouns to Describe Change
An adjective + noun phrase gives a grammatical alternative to a verb + adverb construction.
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Adjective
Noun
Example
considerable
decrease
There was a considerable decrease in visitor numbers.
dramatic
decline
The graph shows a dramatic decline after 2015.
gradual
drop
There was a gradual drop over three years.
rapid
fall
The period ended with a rapid fall.
sharp
rise
Cardiff experienced a sharp rise in 2018.
significant
increase
There was a significant increase from 2010 to 2012.
slight
fluctuation
The line showed a slight fluctuation.
steady
growth
The decade saw steady growth.
6.4 Linking and Comparison Words
Sequence: initially, subsequently, after this, by the end of the period, finally
Contrast: however, whereas, while, by contrast
Similarity: similarly, likewise, in a similar way
Data reference: with the figure at..., respectively, compared with..., approximately
Use linking words only when the relationship is clear. Starting every sentence with then or however makes the report mechanical.
6.5 Time Expressions
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Time phrase
Example
At the beginning of the period...
At the beginning of the period, Dublin had far more visitors than Cardiff.
At the end of the period...
At the end of the period, Cardiff's figure exceeded Dublin's.
In the first / final year...
In the final year, Dublin received exactly 2 million visitors.
From...to...
The figure rose from 1.5 million to 2.3 million.
Between...and...
Numbers fell between 2015 and 2017.
Over the following three years...
Over the following three years, the total increased gradually.
By 2020...
By 2020, Cardiff had reached 5 million visitors.
7. Grammar for IELTS Writing Task 1 Line Graphs
Use a range of structures only when you can control them accurately. The Task 1 report grammar guide provides additional practice.
7.1 After + -ing
After falling considerably to 2.5 million in 2015, the number then rose dramatically to 5 million in 2020.
7.2 Having + Past Participle
Having fallen considerably to 2.5 million in 2015, the number then rose dramatically to 5 million in 2020.
7.3 After Which / At Which Point
These structures can connect two consecutive changes:
The number of visitors to Cardiff dropped to 1.5 million in 2015, after which it rose sharply to 4 million in 2018.
Dublin's figure increased slightly to 2.5 million in 2015, at which point it began a steady decline.
7.4 Choosing the Correct Tense
Past data:rose, fell, remained.
Current facts:shows, stands at, remains.
Predictions:is predicted to rise, is expected to fall, will probably remain.
8. IELTS Writing Task 1 Line Graph Sample Answer
The graph gives information about the visitors to Cardiff and Dublin from 2010 to 2020.
Summarise the information by selecting and reporting the main features and make comparisons where relevant.
Write at least 150 words.
Complete model report
Line graph sample report
Introduction The graph shows information about how many people visited Cardiff and Dublin over a 10-year period between 2010 and 2020.
OverviewOverall, what stands out from the graph is that there was an upward trend in the number of visitors to Cardiff, but the number of visitors to Dublin saw a significant decrease over the period. A further point is that Dublin had more visitors in 2010, but by 2020 Cardiff was much more popular.
Body 1In detail, the number of visitors to Cardiff started at around 1.5 million in 2010, after which the figure rose steadily to about 2.3 million in 2013. It then levelled off and remained at this point until 2014. Having fallen slightly to about 1.7 million in 2017, visitor numbers soared, rising sharply to just under 4 million in 2018. Lastly, there was a gradual increase, with the final figure reaching 5 million in 2020.
Body 2However, the trend for Dublin was very different. Visitor numbers started at around 4.9 million in 2010, after which there was a considerable fall to approximately 2.3 million in 2013. Following a slight increase to 2.5 million in 2015, the figure declined steadily to just over 2 million before finishing at 2 million.
WRITING PREPARATION
Turn this Writing method into timed practice
Use Benchmark's IELTS course to build task strategy and practise across skills. If you already have an answer ready, submit it for IELTS Writing correction and feedback.
This report is intended as an estimated Band 9-level model for teaching. It is not an official examiner result, and an actual score depends on the complete response and examiner assessment.
Task Achievement
The introduction is accurate, the overview identifies both overall directions and the final contrast, and the body paragraphs support the key changes with figures.
Coherence and Cohesion
The four paragraphs each have a clear function. Cardiff and Dublin are grouped separately, which makes the contrasting trends easy to follow.
Lexical Resource
Trend language includes rose steadily, levelled off, soared, gradual increase, considerable fall and declined steadily.
Grammar
Past tense is controlled and the report uses complex structures such as having fallen slightly and after which accurately.
Paragraph plan: paragraph 1 paraphrases the task; paragraph 2 gives the overview; paragraph 3 reports Cardiff's changes; paragraph 4 reports Dublin and reinforces the contrast.
9. Common Errors and How to Avoid Them
Problem 1: Describing every data point
Fix: select and support the important features. Official IELTS guidance allows minor points or details to be omitted, but the main features must be covered accurately.
Problem 2: Giving trends without figures
Weak: Cardiff's visitor total dropped and then rose sharply.
Better: Cardiff's visitor total dropped to about 1.7 million in 2017 before rising sharply to just under 4 million in 2018.
Problem 3: Writing details but no overview
Fix: add a separate overview that states the main directions, contrasts or crossings. Do not turn it into a list of numbers.
Problem 4: Using the wrong tense
Fix: use past tense for completed years and qualified forecast language for predicted values.
Problem 5: Exaggerating small changes
Fix: match degree words to the visual. Use slightly for a small change and reserve soared or plummeted for a clearly large movement.
10. IELTS Line Graph FAQs
How do I write an IELTS Writing Task 1 line graph?
Analyse the axes, units, dates and lines; select the main trends; write an introduction and overview; then support the key features in two logically grouped detail paragraphs.
What should an IELTS line graph overview include?
Include the largest overall rises or falls, stable or fluctuating patterns, important crossings, and the most noticeable highest or lowest result. Avoid listing every number.
What tense should I use for a line graph?
Use past tense for completed periods, present tense when the graph describes current facts, and forecast forms such as “is predicted to” for future estimates.
What vocabulary is useful for a line graph?
Use precise direction words such as rise, fall, remain stable, fluctuate, peak and level off, combined with degree words such as slightly, steadily, sharply and significantly when the data supports them.
Do I need a conclusion for IELTS Academic Task 1?
No separate conclusion is normally needed. The overview performs the summary function, while the detail paragraphs support it with selected figures.
How many words and paragraphs should I write?
Write at least 150 words. Four paragraphs—introduction, overview and two detail paragraphs—are a reliable structure, although clear organisation matters more than a fixed paragraph count.
11. Quiz: Check Your Understanding
Answer all ten questions, then select Check to see your score and explanations.
