Band 4.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.5 · Cambridge IELTS 19 · 2026-09-28

IELTS Writing Task 1 question

 

The diagram below shows how a biofuel called ethanol is produced.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Student answer (Band 4.5)

The picture ilustrate proccess of ethanol in diverse kind and how a biofuel ethanol is made up.

overall the process of biofuel made up.there are many different types of stage one the energy sunlight and carbon dioxide helps to grow a plants and trees afterward. the cutted trees and plants loaded in tractor and goes upto wood mail for harvesting in harvest machine. then proccess starts and the harvested stuffs of plants and tree goes for pre procesing on machine and it's turned to cellulose chemicals.

In following the cellulose chemical on processings to divide various sections like it filtered and the sugars comes from the processing however the microbes added in sugars to create ethanol and finally it's turned in ethanol form and the ethanol form is carbon dioxide although the car,trucks and aeroplane these all transportation vechiles use a ethanol and the vechiles produced a carbon dioxide form.

AI examiner evaluation

Task Achievement / Task Response: Band 5.0

The candidate attempts to describe the process of ethanol production from the diagram, mentioning key stages such as energy from sunlight, plant growth, harvesting, pre-processing into cellulose, processing into sugars, and the addition of microbes to create ethanol. However, the response falls short of fully presenting a clear overview or accurately summarizing all main features due to significant linguistic barriers. Key steps are conflated or described with confusing phrasing, such as stating that 'the ethanol form is carbon dioxide'. While the general progression is identified, the underdeveloped explanation and misinterpretation of relationships place this performance at Band 5.

Coherence and Cohesion: Band 5.0

The response is divided into three paragraphs, but paragraphing is not used effectively to structure the progression of the process. Cohesive devices are weak, repetitive, and occasionally inaccurate ('In following', 'however', 'although'). There is a lack of smooth transitions between the different stages of the cycle, leading to a disjointed reading experience. The overall organization shows some attempt to follow the diagram sequentially, but logical progression breaks down due to poor sentence linking and unclear referencing (e.g., pronoun use like 'it's turned').

Lexical Resource: Band 4.5

The lexical range is extremely limited and inadequate for an academic task. The student relies heavily on basic vocabulary and direct repetition of terms from the prompt ('ethanol', 'carbon dioxide', 'plants and trees'). There are numerous word-form and spelling errors throughout ('ilustrate' instead of illustrate, 'proccess' instead of process, 'cutted', 'mail' instead of mill, 'vechiles'). Attempts to use less common vocabulary fail due to inaccurate word choice and poor collocation, frequently causing confusion for the reader.

Grammatical Range and Accuracy: Band 4.0

Grammatical control is weak throughout the response, featuring a very limited range of sentence structures. Most complex sentence attempts are faulty, incomplete, or grammatically confused (e.g., 'the picture ilustrate proccess of ethanol in diverse kind and how a biofuel ethanol is made up'). There are persistent errors in basic grammar, including subject-verb agreement, missing articles, incorrect prepositions, and run-on sentences. Punctuation is also poorly handled, with missing capitalisation at the start of sentences and incorrect spacing around periods.

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