Band 4.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.0 · IELTS Momentum Workout · 2026-08-12

IELTS Writing Task 1 question

The diagram below shows how a mechanical arm works, and how the joints that make up the arm function in the same way as those in a human arm. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Student answer (Band 4.0)

The diagram demonstrate the mechanical arm works in the computer and three motors. the left hand side motor is a shoulder that is raised/lower arm and the middle motor is of elbow movement and at the right heand motor is reflecting the gripper control force.

to begin with the base that is usually used for movable of stationary/ocassionally. at the top the computer is a precision and divided into three motors where the motors are partly illustrated into threee columns where first motor helps to raise the lower arm , the second motor helps elbow to allow the flexibility, and the last that is third motor helps to built the contol face of the computer.

moving forward the computer is having a base that is used for movable, nevertheless thier is alternative end effectors to the system. their is also wirst that allows to have a alternative rotate.

I conclude that the above daigram showed the joints that function in the samw ways to a human arm.

AI examiner evaluation

Task Achievement / Task Response — Band 4.0

The response attempts to describe the mechanical arm, but it fails to provide a clear or accurate summary of the diagram. The description of the motors and their functions is confusing and contains factual inaccuracies regarding the labels provided in the prompt. While the response identifies the comparison to a human arm, the explanation of how the components work is underdeveloped and lacks the precision required for an Academic Task 1 report. The information is presented in a way that is difficult to follow, and the main features are not clearly highlighted or compared.

Coherence and Cohesion — Band 4.0

The essay lacks a logical structure. While there are paragraph breaks, the progression of ideas is disjointed. The use of cohesive devices is mechanical and often misused, such as 'to begin with' and 'moving forward,' which do not effectively link the information about the mechanical arm. Referencing is frequently unclear, making it difficult for the reader to follow the description of the components. The overall arrangement of information is not coherent, and the lack of clear transitions between the parts of the arm hinders the flow of the report.

Lexical Resource — Band 4.0

The vocabulary is very limited and often inaccurate. There are numerous spelling errors (e.g., 'heand', 'ocassionally', 'threee', 'wirst', 'daigram', 'samw') and word choice issues (e.g., 'built the contol face', 'alternative rotate'). The student struggles to use technical terminology correctly, which is essential for this type of task. The range of vocabulary is insufficient to convey the information clearly, and the repeated errors in basic spelling and word formation significantly impede the reader's understanding.

Grammatical Range and Accuracy — Band 4.0

The response contains frequent grammatical errors that often distort the meaning. There are issues with subject-verb agreement ('The diagram demonstrate'), article usage, and sentence structure. Many sentences are fragmented or poorly constructed, such as 'the left hand side motor is a shoulder that is raised/lower arm'. The range of structures is very limited, consisting mostly of simple, error-prone sentences. Punctuation is also inconsistent, with missing capital letters at the start of sentences and incorrect usage throughout the text.

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