Practice Exercise for IELTS Diagrams

Below is a practice exercise to help you improve your IELTS diagrams. You need to fill in the gaps in the paragraph below with the appropriate article or correct form of the noun (a / an / the / nothing / plural). These are the most common mistakes that students make with IELTS diagram descriptions.

The  diagram below shows how hydro-electric power is generated.

ielts diagram practice

Source: the diagram above was not designed by IELTS Liz. Source unknown.

Questions 1-10

This exercise is to develop accuracy with grammar. Complete the paragraph below by either adding an article (a/an/the/nothing) or by having a plural noun. Here is an example to help you understand :


(1) ……..(Electricity)  is generated by (2) ………..(water)  passing through(3) ………….(turbine).  Answers

  • Electricity (no article and no plural)
  • water (no article and no plural)
  • a turbine (we must use an article here as this is a countable noun and we are introducing it for the first time)

Diagram Exercise

It can be seen that (1) ……………………(evaporation) is caused by (2) ………………….(sun’s heat) and results in (3) …………….(cloud formation) which later leads to (4) …………….. (rain). As rain falls, it is collected in (5) ………………… (reservoir) which is controlled by (6) ………….(dam). The flow of the water from (7) ……………(dam), is controlled by (8) ………….. (valve) which opens and closes to allow water to flow to (9) ………….. (turbine) below for (10) ………… (production) of electricity.


Click below to reveal the answers:

It can be seen that (1) evaporation is caused by (2) the sun’s heat and results in (3) cloud formation which later leads to (4) rain. As rain falls, it is collected in (5) a reservoir which is controlled by (6) a dam. The flow of the water from (7) the dam, is controlled by (8) a valve which opens and closes to allow water to flow to (9) a turbine below for (10) the production of electricity.



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  1. Abhishek Chakraboty says

    Thank you very much mam for the work you are doing for all of us. I have learned so many things from here and improved me a lot.
    Here I am posting my writing and am expecting that you will rectify my mistakes.

    The diagram illustrates how hydro-electric power is being generated through various processes. Overall, the sea water forms cloud through evaporation and it is collected in a reservoir after raining.The flow of water is being converted through various processes to produce electricity.

    Initially, the rain water is collected in a reservoir which is controlled by the dam and a valve is there to open and close the dam depending on the water flow. From this point the water is directed towards turbine to make hydro electric power. The excess water is backed to reservoir being pumped.

    After the generation of electricity, it is directed straight through high voltage cables to the transformer station. From there the electricity travels into the underground cables and reaches to the hospitals and schools in the town.

  2. Hi Liz,
    great page! Thank you very much for doing this.
    I´m quite sure there´s a “for” missing in the text just before (10). The sentence made no sence to me until I read the answer where the “for” suddenly appeared.

    Kind regards

  3. Rustam Assanbayev says

    The answer:
    The diagram illustrates the process of generating hydro-electric power.
    Overall, the process consists of circulation of liquid and gas transferring through high voltage cables to various points.
    To begin with, water evaporates from the sea due to the sun`s heat, and after, as rain falls water is collected in the reservoir. The movement of the water is regulated by the valve of the Dam where the collected water goes to the turbine for producing electricity.
    The next step is the produced electricity is directed through the high voltage cables to the transformation station. Finally, it is transferred via the underground cables to houses, schools, factories, and hospitals.

  4. Khairi Juwaidi Bin Mansor says

    Hello Ms. Liz. I already done the Ielts today.. And i use all your study… And i think i have done great just now. .. Thanks a lot.. And pray for me for the result.. 13 days from now😊
    KJ, Malaysia

  5. H i LIZ

  6. Dear Liz,
    I would like to thank you for your fabulous work for us as a students . Acutually , I have a complicated trouble in using of articles ( a , an , the ) . I will appreciate if you can make a video lesson about how to use them in correct way .
    Yours Sincerely

  7. Hi Liz,when giving information about a diagram -take for instance the one on generation of hydro-electric power where the distribution of the electricity by underground cable is to two structures not labelled and then to schools and hospitals.Though this structures are not named but we know what they look like,can the assumed names be written without having it on the diagram.

    • If the structures are easily identifiable, you can write them. However, although I can see one is obviously housing, the other is not so clear. So, you could refer to housing and other buildings. You can only assume when the image is evidently symbolic of something.
      All the best

  8. Dear Liz,
    I was watching an important example of T1 about “the water usage in the average Australian home during the years 2004” which was the combination of the diagram and the graph. Unfortunately , I missed it suddenly and could not find it again. It was explaining the steps of writing clearly.
    Please help me to have this lesson via direct link. This is the weakness of me in T1 how to mix two sources of data.

  9. Thanks for you advice Liz I will use it

  10. Sherif Mahmoud says

    Hi Liz, thank you very much for you great help to all of us , I am looking forward to meet you soon to thank you again.
    would you please have a look on this?
    Yours , Sherif .
    the underlying diagram shows how electricity is generated from water.
    Overall this process is divided into two parts, generation and distribution. The generation starts when sun heat evaporizes sea water , leading to formation of huge clouds rich in rain water ,which falls later in a reservoir sealed by a dam and close and open valve.
    The water is allowed to flow through the valve to pass into a turbine and a pump, to produce electricity and to bring the water back into the reservoir ,respectively.
    the electrical current which is generated from the first step will be transferred via high voltage cables to transformation stations to modify its strength before sending it to homes, schools, hospitals and other facilities.

  11. Hi Liz sorry for disturbung I also would like read your comment about my writing
    This diagram shows how to produce electricity from the water.
    First of all sun rises and makes saline water from sea evaporate.In the sky vapour condenses and converts to the clouds.If clouds full rain occurs.Then rain water collects into the artificial reservoir,which has dam to protect water from overflowing.The valve which is installed behind the dam is used to control the amount of water.Next water flows through the valve to the turbine.Simultaneously pump which is installed beneath turbine pumps water again to the reservoir and causes the water to circulate.This process causes to produce electricity.After that electricity flows through high voltage cables to the power towers.Finally after passing power towers electricity is transferred for consuming.

  12. hi lizz




    • Sorry I do not offer free marking or paid marking or private lessons. You will need to find a local teacher or a teacher online to help you.
      All the best

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