Line graphs are one of the most common visual types in IELTS Academic Writing Task 1. Many students describe every data point and run out of words. The key is selection and overview. Here's how to do it correctly.
The 4-Paragraph Structure
- Paragraph 1 — Introduction: Paraphrase the question. Describe what the graph shows in one or two sentences. Do not copy the question word-for-word.
- Paragraph 2 — Overview: Describe the main trends without specific data. This is the most important paragraph and the one most students skip.
- Paragraph 3 — Key Details (Group 1): Select 2–3 significant data points that support your overview.
- Paragraph 4 — Key Details (Group 2): Contrast or complement with the remaining trend.
The Overview: Why It's Critical
An overview summarises the most important trends without specific numbers. It is what separates Band 5 from Band 7. A strong overview answers: What are the main things happening in this graph overall?
Band 5 (no overview): "In 2000, sales were 50 units. In 2005, they were 75 units. In 2010, they were 90 units..."
Band 7 (with overview): "Overall, sales rose steadily throughout the period, while costs remained relatively stable, resulting in a widening profit margin by 2020."
Vocabulary for Line Graphs
Verbs for increase: rose, increased, climbed, surged, grew, jumped
Verbs for decrease: fell, dropped, declined, decreased, plummeted, dipped
Adverbs for degree: sharply, dramatically, significantly, gradually, steadily, slightly, marginally
Verbs for stable: remained stable, levelled off, plateaued, stayed constant, fluctuated around
Common Mistakes
- Describing every data point — select only the most significant changes and values.
- No overview paragraph — this is the examiner's first check for Band 6+.
- Using the same verb repeatedly — "increased... increased... increased" will lower your Lexical Resource score.
- Giving reasons for trends — Task 1 describes what the graph shows, not why.