Band 4.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.5 · Cambridge IELTS 19 · 2026-10-12

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 diagram below illustrate the process fo makeing biofule from tress which known as ethanol.

Overall, for making biofule is comes from plants and trees and than it processed in to a factory by processing some crucial ingridiante will collect and modify so that they can be use in a vehical such as

car,truck and plane.

To begine with plants and tress are harvest by farmers and pre processed it to extract cellulose

AI examiner evaluation

Task Achievement / Task Response: Band 3.5

The response identifies the general subject and gives a brief overview that ethanol is made from plants and trees and can be used by vehicles. It also mentions harvesting, pre-processing and cellulose, so some relevant stages are selected. However, the account is very incomplete: it stops before explaining processing into sugars, the addition of microbes, ethanol production, or the carbon-dioxide loop. The overview also does not clearly describe the cyclical nature of the process, and the claim that ingredients are “modify[ied]” is too vague to report the stages accurately. The response is 77 words below the required minimum, which contributes to the limited coverage. To improve, describe the full sequence and highlight how carbon dioxide returns to support plant growth.

Coherence and Cohesion: Band 5.0

There is a basic attempt to organise the response: an opening sentence introduces the diagram, a separate paragraph gives an overall statement, and “To begin with” signals the start of the process description. These choices provide some structure. However, progression is not sustained because the process account ends after cellulose, leaving most stages unconnected. The overview sentence also combines several ideas in a confusing sequence, and the final line has no concluding continuation. Use one paragraph for a concise overview and another to trace the stages in order, linking them with clear transitions such as “Next,” “After this,” and “Finally.” This would make the sequence easier to follow without relying on a few isolated signals.

Lexical Resource: Band 5.0

The response uses a small set of relevant process terms, including “harvest,” “pre-processed,” “cellulose,” and “processing,” and it names examples of transport. This shows some task-related vocabulary. However, the range is limited, and several spelling errors or imprecise expressions make the description less clear, including “biofule,” “tress,” “ingridiante,” and “vehical.” Phrases such as “some crucial ingredients will collect and modify” do not accurately express the diagram’s stages. Aim to use precise process vocabulary and check spelling carefully. For example, describe cellulose being processed into sugars, then explain that microbes are added before ethanol is produced.

Grammatical Range and Accuracy: Band 4.5

The response attempts both simple statements and a longer overview sentence, and the basic meaning is sometimes recoverable. However, control of sentence structure and verb forms is weak. In “The diagram below illustrate,” the subject and verb do not agree; “which known as ethanol” is missing a verb; and “for making biofuel is comes” contains an incorrect construction. The phrase “plants and trees are harvest by farmers and pre processed it” also has problems with passive form and pronoun agreement. Most sentences contain errors, and these sometimes make relationships between ideas difficult to understand. Build accurate short sentences first, using patterns such as “Plants and trees are harvested” and “The material is then processed,” before attempting longer sentences.

See this exact question answered at other band scores. The same prompt compared across bands.

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