Band 4.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.0 · IELTS Momentum Workout · 2026-10-22

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 below show the mechanical arm works and how the joints that make up the arm function in the same way as those in a human arm,

First of all, the computer precision control of three motors. And all the motors different work the one motor the work of allow to elbow allows the movement and the one motor the work the gripper built in sensors control force and last motor show the work of wrist allows the gripper to flex and the basi

AI examiner evaluation

Task Achievement / Task Response: Band 3.0

You identify the diagram as a mechanical arm and mention the computer, three motors, elbow, gripper sensors and wrist, so some relevant components are recognised. However, the account is incomplete and does not explain the arm’s overall arrangement or key functions, including the shoulder, pivot, base and alternative end-effectors. The description also ends mid-sentence at “the basi,” leaving the process unfinished. The response is substantially below the required 150 words: 23 words copied from the prompt were excluded from the count, and the response is 88 words short. To improve, give a brief overview, then describe the main parts and their functions in a complete, accurate sequence.

Coherence and Cohesion: Band 3.0

There is a basic attempt to organise the description, beginning with the computer and then listing motor-linked parts. The phrase “First of all” signals a start, and “last motor” suggests an order. However, the response is one unfinished sentence, so the relationships between the components are difficult to follow. Repeated wording such as “the one motor the work” does not clearly show which motor controls which part, and the final phrase “and the basi” breaks off without completing the idea. Use separate sentences or paragraphs to distinguish the control system, the arm’s joints and the end-effector, and use clear links such as “one motor controls…” and “another operates…”.

Lexical Resource: Band 5.0

The response includes several relevant technical terms from the diagram, including “computer,” “motors,” “elbow,” “gripper,” “sensors” and “wrist.” These show some task-specific vocabulary, and “built in sensors control force” conveys a recognisable function. However, the range is narrow and several phrases are unclear or inaccurately formed, particularly “the computer precision control” and “the one motor the work of allow to elbow.” This makes it hard to understand the intended relationships. Build a small set of precise process-description phrases and use them consistently, such as “is controlled by,” “is connected to,” and “allows the arm to rotate.” Check compound forms such as “built-in” and avoid repeating “work” where a more exact verb is available.

Grammatical Range and Accuracy: Band 4.0

There is an attempt to use a present-tense description, and the response includes short clauses about the motors and the gripper’s sensors. However, sentence structure is very limited and the clauses are frequently incomplete or incorrectly joined. For example, “The diagram below show…” has subject–verb disagreement, while “First of all, the computer precision control of three motors” is a fragment without a finite verb. The long sequence beginning “And all the motors…” lacks clear clause boundaries, and the final “and the basi” is unfinished. Practise writing complete sentences with a subject and verb, for example, “The computer precisely controls three motors.” Then use one clear sentence for each component and check agreement, articles and punctuation.

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

Browse more IELTS Writing model answers or get your own writing scored by the same AI examiner.