IELTS Writing Task 1 Describing Trends: Vocabulary, Grammar, and Band 9 Techniques

What Does Describing Trends Mean in IELTS Writing Task 1?

In IELTS Academic Writing Task 1, describing trends means using precise language to communicate how data values change over time — whether they rise, fall, fluctuate, or remain stable. Trend language is the foundation of body paragraph writing for line graphs, bar charts, and tables that span multiple time points. It is distinct from the overview, which states the big picture without figures, and from the introduction, which simply paraphrases the prompt.

Examiners assess trend language under two of the four marking criteria: Lexical Resource (the range and precision of your vocabulary) and Grammatical Range and Accuracy (your use of correct tense, subject-verb agreement, and sentence variety). Cambridge Assessment English Band Descriptors (2024) specify that Band 7 requires “sufficient range of vocabulary to allow some flexibility and precision” — meaning you must vary your trend verbs and adverbs rather than repeating the same combination in every sentence. For context on how this interacts with your overall score, see the Writing band score calculation guide, which explains how Task 1 feeds into your final Writing band.

The Four Core Trend Movements

Almost every trend in Academic Task 1 can be categorised into one of four movement types. Each movement type has a set of verbs, nouns, and adverbs that examiners expect to see varied across a response.

The degree adverbs are interchangeable across rise and fall verbs — you can write “rose sharply,” “declined sharply,” “increased gradually,” or “fell gradually.” However, do not use “dramatically” or “sharply” unless the data genuinely shows a steep change. Using extreme adverbs for modest changes is an inaccuracy that costs marks under Task Achievement. IDP Education (2024) notes that misrepresenting the scale of a trend is one of the most penalised errors in Band 5–6 Task 1 responses.

Grammar of Describing Trends: Tense, Subject, and Sentence Form

Choosing the correct tense

For data covering a completed time period in the past (e.g., 1990–2020), use the simple pasttense: “The number of visitors rose from 2 million to 5 million between 2000 and 2010.” For data that is presented as current or ongoing (e.g., a table of 2024 statistics without an end date), use the simple present: “The table shows that renewable energy accounts for 32% of total supply.” Mixing tenses incorrectly — using present tense for completed historical data — is a grammatical error noted by Cambridge Assessment English examiners (2024) as a reliable indicator of Band 5–6 writing.

Verb form vs. noun phrase

One of the most effective ways to vary your sentence structure in ielts writing task 1 describing trends is to alternate between verb forms and noun phrase constructions for the same movement:

Using both forms across your response demonstrates grammatical range — a key Band 7+ marker under Grammatical Range and Accuracy. British Council IELTS preparation resources (2024) confirm that candidates who consistently use only verb forms, or only noun phrases, score lower on this criterion than those who alternate deliberately.

Subject selection: the data or the quantity?

You can make either the data value or the underlying quantity the subject of the sentence. Both are correct: “The number of cars rose” and “Car ownership rose” are both acceptable. Varying your subject choice — sometimes using “the figure for X,” sometimes “X itself,” sometimes a passive construction — adds to the impression of Lexical and Grammatical range without introducing errors.

Describing Multiple Trends and Exceptions

Most Task 1 charts contain more than one trend. Band 9 responses describe multiple movements efficiently and identify exceptions — the one category that diverges from the overall pattern. The vocabulary below signals the relationship between trends.

• Contrast:“While Category A rose, Category B experienced a slight decline.” / “In contrast, …” / “Conversely, …”
• Similarity:“Both A and B followed a similar upward trajectory.” / “A and B rose in tandem, reaching approximately the same figure by 2020.”
• Exception:“The only exception was Category C, which bucked the trend and fell slightly.” / “Category D diverged from this pattern, remaining stable throughout.”
• Crossover:“By 2015, Category B had overtaken Category A, a reversal of the positions seen in 2005.”

Identifying exceptions is a Band 9 marker under Task Achievement because it demonstrates you have analysed the data rather than simply listed values. Cambridge Assessment English (2024) notes that responses that only describe the dominant trend without noting counterexamples are typically capped at Band 7 for Task Achievement, because they do not fully satisfy the requirement to “highlight significant exceptions.”

Band 9 Sample Answer with Annotated Trend Language

Prompt:“The line graph below shows the number of visitors to three museums in London between 2010 and 2023. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.”

Introduction: The line graph illustrates how many people visited three London museums over a thirteen-year period from 2010 to 2023.

Overview: Overall, visitor numbers rose at two of the three museums across the period, while the third experienced a prolonged decline. The Natural History Museum consistently attracted the largest crowds throughout.

Annotation: The overview identifies the dominant trend (two rising, one falling) and the standout category — without any figures. For more on writing overviews, see the Task 1 overview guide.

Body Paragraph 1: In 2010, the Natural History Museum led with approximately 4.8 million visitors, while the Science Museum and Tate Modern attracted 2.9 million and 2.4 million respectively. Over the following decade, the Natural History Museum saw a steady increase, climbing to 5.6 million by 2020. The Science Museum followed a similar upward trajectory, rising graduallyto 3.5 million over the same period. In contrast, Tate Modern’s figures fluctuated considerablybetween 2012 and 2016 before beginning a gradual decline.

Annotation: Three different trend verbs are used across the paragraph: “climbing,” “rising gradually,” and “fluctuated considerably.” The noun phrase “a gradual decline” alternates with the verb forms for grammatical variety. The contrast signal (“In contrast”) correctly flags the exception case (Tate Modern). This is the ielts writing task 1 describing trends technique that distinguishes Band 8–9 responses.

Body Paragraph 2: The most dramatic changes occurred between 2020 and 2023. Natural History Museum numbers surged to 6.2 million — a sharp rise of nearly 11% in three years — while the Science Museum levelled off at around 3.6 million. Tate Modern, by contrast, fell sharply to 1.8 million by 2023, its lowest point in the period, representing a cumulativedecline of 25% from its 2010 baseline.

Annotation: The verb “surged” signals a more dramatic rise than “rose” or “increased,” justified by an 11% jump in three years. “Levelled off” accurately describes stability. The paired noun and verb forms (“a sharp rise” and “fell sharply”) within the same paragraph demonstrate range without repetition. Approximate word count: 195 words.

Vocabulary for IELTS Writing Task 1 Describing Trends

The lists below give you the full verb–noun–adverb toolkit organised by movement type. A broader vocabulary resource — covering all chart types and including comparison language — is in the Task 1 vocabulary guide.

Rise verbs and nouns (strongest to weakest)

• surged / rocketed / soared — use only for very large, rapid increases (15%+ in a short period)
• rose / increased / grew — the general-purpose trio; vary these across paragraphs
• climbed / crept up / edged upward — suggest gradual, sustained growth
• Noun equivalents: a surge / a rise / an increase / growth / a climb

Fall verbs and nouns (strongest to weakest)

• plummeted / collapsed / plunged — use only for steep, rapid falls (15%+ in a short period)
• fell / decreased / declined / dropped — general-purpose; vary these
• dipped / slipped / eased / edged down — suggest modest or gradual falls
• Noun equivalents: a fall / a decrease / a decline / a drop / a dip

Stable and fluctuation language

• remained stable / held steady / stayed constant / plateaued / levelled off
• fluctuated / varied / oscillated / experienced ups and downs
• Noun equivalents: stability / a plateau / fluctuation / variation / instability

Adverbs and adjectives for degree

• sharply / dramatically / steeply / rapidly — steep or fast changes
• significantly / substantially / considerably / markedly — notable but not extreme changes
• steadily / consistently / gradually / moderately — sustained, predictable changes
• slightly / marginally / modestly / barely — small changes (use when the data shows minor movement only)

Common Mistakes When Describing Trends in Task 1

Using the same verb throughout the response

Writing “increased” in every sentence is the clearest signal of limited Lexical Resource. Examiners are trained to notice when a candidate uses the same word repetitively — and the Band Descriptors (Cambridge Assessment English, 2024) explicitly link Lexical Resource band scores to the ability to “use a variety of vocabulary with some flexibility.” A simple rule: never use the same trend verb more than once per paragraph. Write a list of three synonyms before you begin your body paragraphs and rotate through them.

Using extreme adverbs for modest changes

Writing “plummeted dramatically” for a 3% fall, or “skyrocketed” for a 5% rise, is a Task Achievement error because it misrepresents the data. Accuracy is a core expectation of the Task Achievement criterion — the data must be described faithfully. If the change is modest, use “declined slightly” or “rose marginally.” Reserve “surged,” “plunged,” and “dramatically” for genuinely steep movements.

Wrong tense for completed historical data

Using present tense for past data is a persistent grammatical error: “In 2010, the figure increases to 4 million.” Whenever the chart covers a completed time period that ended in the past, use the simple past tense throughout the body paragraphs. Mixing tenses within a single paragraph is assessed under Grammatical Range and Accuracy and is one of the errors most closely associated with Band 5 writing (IDP Education, 2024).

Describing every data point instead of selecting key features

Some candidates attempt to report every number on the chart in a mechanical list: “In 2000 it was 10, in 2002 it was 12, in 2004 it was 14…” This is not a task achievement — it is transcription. The task instruction says “summarise” and “select the main features.” Selecting means choosing the most significant values: the starting point, the endpoint, the peak or trough, and any crossover. Ignoring this selectivity principle caps Task Achievement at Band 5, regardless of how accurate the numbers are (Cambridge Assessment English, 2024).

Omitting comparisons between categories

When a chart shows multiple categories, the task instruction explicitly asks you to “make comparisons where relevant.” Candidates who describe each category in isolation — never comparing them — lose marks on Task Achievement and Coherence and Cohesion. Comparison language such as “while,” “whereas,” “in contrast,” and “similarly” signals that you have analysed the relationship between the data series, not just described each one separately. British Council IELTS marking guidance (2024) lists missing comparisons as one of the most frequent weaknesses in Task 1 responses from candidates in the Band 5.5–6.5 range.