Band 4.0 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.0 · IELTS Momentum Workout · 2026-10-28

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

Overall, this report shows the complete process of mechanical arm and his work. To began with, firstly we use computer precision control of motors, then we need three motors

AI examiner evaluation

Task Achievement / Task Response: Band 3.0

The response identifies the subject as a mechanical arm and begins to mention computer control and three motors, so it shows a basic understanding of the diagram. However, it does not provide a usable summary of how the arm’s parts function or compare them with human joints. Important features—including the shoulder, pivot, elbow, wrist, gripper, and alternative end-effectors—are not reported. The overview, “complete process of mechanical arm and his work,” is too vague to convey the main features, and the description stops before explaining the process. The response contains 41 words, below the required 150; 16 words copied from the prompt were excluded from that count. To improve, cover the main components and their functions, and include the alternative tools shown.

Coherence and Cohesion: Band 3.0

There is a basic attempt to organise the response: an opening sentence is followed by an overview beginning “Overall,” and a sequence marker, “To began with, firstly.” This gives the reader a limited sense of progression. However, the response ends mid-description after introducing the three motors, so the ideas do not develop into a complete account. The sequence markers are also repetitive (“To began with, firstly”), and the relationship between the computer, motors, and arm components is not explained. Use separate paragraphs for an overview and the main details, then connect the parts in a clear order—for example, from the base and shoulder through to the gripper—and use linking words only where they clarify relationships.

Lexical Resource: Band 4.5

The response uses some relevant task vocabulary, including “mechanical arm,” “joints,” “computer,” and “motors,” which makes the topic identifiable. However, the range is very limited, and several phrases are vague or awkward, such as “complete process of mechanical arm and his work.” The wording “function in same way as those in a human way” also repeats “way” without clearly expressing the comparison. Because the response is so short, it does not demonstrate vocabulary for the diagram’s key components or their functions. Build a more precise set of terms from the labels, such as “pivot,” “shoulder joint,” “flex,” and “rotate,” and use concise functional phrases such as “allows the arm to rotate.”

Grammatical Range and Accuracy: Band 4.5

The response attempts both a complex opening sentence and a sequence statement, but grammatical control is inconsistent. In “illustrates, how,” the comma incorrectly separates the verb from its clause; “in same way” is missing an article, and “a human way” does not form a clear comparison. “To began with” uses the wrong verb form, while “we use computer precision control of motors” has unclear article use and sentence structure. The final sentence also stops after “three motors,” leaving the thought incomplete. These examples show that basic meaning is partly recoverable, but errors and incomplete construction limit clarity. Practise accurate simple sentences first, then combine them with clauses such as “which allows the arm to rotate,” checking articles, verb forms, and punctuation.

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