Let’s be honest: staring at an IELTS Writing Task 1 question can be daunting. You’ve got graphs, charts, or diagrams in front of you, and the clock is ticking. You know what to say—you can see the numbers going up and down—but suddenly, you freeze. “Wait, is it ‘rose’ or ‘has risen’? Should I use ‘was built’ or ‘had been built’?”

Sound familiar? You aren’t alone. In my years of teaching IELTS, I’ve seen brilliant students lose easy marks simply because they got tangled up in their tenses.

The good news? You don’t need to master every single tense in the English language to score a Band 7 or higher in Task 1. You just need to know which ones to use for specific types of questions. Once you crack this code, your writing will flow much more naturally.

Let me break it down for you.

The Golden Rule: Check the Dates First

Before you write a single word, look at the x-axis of your graph or the label on your map. What year is it?

• If the years are in the past (e.g., 1990, 2005), you’re firmly in Past Simple territory.
• If there are no dates at all, or it’s a process diagram, you’ll likely need the Present Simple.
• If the dates go into the future (e.g., 2030, 2050), you’ll need Future forms.

It sounds obvious, right? But in the pressure of the exam room, it’s the first thing to go. Circle the dates on your question paper if you have to!

Static Charts: The Domain of the Past Simple

Imagine you have a bar chart showing the number of car sales in 2010. The year 2010 is finished. It’s over. There’s no connection to now. Therefore, you must use the Past Simple.

Examples:

• “In 2010, car sales stood at 50,000.”
• “The number of students was higher in the UK than in Canada.”

Don’t try to be fancy here. Using the Present Perfect (“have stood”) would be wrong because the time period is finished. Keep it simple.

Dynamic Charts: Moving Through Time

This is where students often get confused. Dynamic charts show changes over a period of time (e.g., from 1990 to 2020). Here, you are describing trends.

1. Describing Past Trends

Most of the time, you will still rely heavily on the Past Simple because the entire period is in the past.

• “Between 1990 and 2000, the population increased dramatically.”
• “Sales fluctuated wildly before stabilizing in 1995.”

Tip: You can occasionally use the Past Perfect to emphasize that one action finished before another, but be careful. It’s often safer to stick to Past Simple unless you are 100% sure.

• “By 2005, the figure had reached a peak of 80%.” (Past Perfect works well with “By 2026” phrases).

2. Describing Trends Leading to Now

If the graph starts in the past and continues up to the present year (e.g., “from 2000 to the present day”), you can use the Present Perfect.

• “Since 2000, the number of internet users has risen significantly.”

Notice the keyword “Since”. If you see “In 2000”, use Past Simple. If you see “Since 2000”, use Present Perfect. Simple as that.

For more on structuring these descriptions, check out our guide on Line Graph Descriptions.

Process Diagrams: The Passive Voice Playground

Process diagrams (e.g., how chocolate is made, or the life cycle of a frog) are completely different. There are usually no dates. You are describing a general truth or a sequence of steps that always happens in the same way.

For this, you need two things:

1. Present Simple Tense
2. Passive Voice

Why Passive Voice? Because in a manufacturing process, we don’t care who packs the boxes; we care that the boxes are packed.

Examples:

• “First, the tea leaves are picked by hand.” (Not “farmers pick the leaves”)
• “Then, they are dried in large ovens.”
• “Finally, the tea is packed into boxes.”

If you are struggling with passive forms, I strongly recommend reviewing our specific lesson on Passive Voice for Academic Writing.

Maps: Past vs. Present Perfect

Maps usually show a location at two different points in time (e.g., a village in 1950 and the same village today). You need to compare what was there with what is there now.

• Past Simple: For the old map. “In 1950, the town had a small market.”
• Present Perfect Passive: For the changes that have happened. “The market has been demolished and replaced by a supermarket.”

Why Present Perfect here? Because the demolition happened in the past, but the result (the new supermarket) is visible now. It’s a bridge between past and present.

Future Projections: Don’t Forget the “Will”

Sometimes, charts include predictions for the future (e.g., 2030, 2050). You cannot use past or present tenses here. You must use language of prediction.

• “Sales are predicted to rise to $1 million by 2030.”
• “The population is expected to fall.”
• “It is estimated that figures will reach a peak in 2040.”

Common Tense Mistakes to Avoid

I grade hundreds of essays, and here are the mistakes I see time and time again:

1. Tense Hopping: Starting a sentence in the past and finishing it in the present. “The price increased in 1990 and goes down in 1995.” (Incorrect! Keep it consistent: “increased… and went down”).
2. Overusing Past Continuous: “The sales were increasing.” It’s usually better to simply say “The sales increased.” Past Continuous is rarely needed in Task 1 unless you are emphasizing a duration, which is uncommon.
3. Using Present Perfect with specific past dates: “In 1990, the rate has increased.” (Incorrect! Never use Present Perfect with “in + year”).

Practice Makes Perfect

The best way to get comfortable with this is to practice. Take a set of Writing Task 1 practice questions, identify the dates, and decide on your tense before you start writing.

Remember, Task 1 is factual. You aren’t telling a story; you are reporting data. Keep your tenses clear, simple, and accurate, and you’ll be well on your way to that target score. You’ve got this!

Need more help with your grammar? Check out our guide on IELTS Writing Tips for more strategies to boost your score.