Band 4.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.5 · IELTS Momentum Workout · 2026-10-21

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 4.5)

The diagram shows the working of a mechanical arm and its comparison with the working of human arm. a computer controls precision of motors that are attached to gripper buillt in sensors contro force and other two at elbow just like tibia and fibula bones of the arm. elbow allows movementand gives flexibility and gripper is built in sensors control force. There is a wrist just like human wrist used to flex and rotate and there is a pivot tha enables it to rotate just like the elbow joint in human arm. there is a shoulder that move upward and downward and forward and backward or raises or lowers just like human shoulder at the bottom there is a base which is usually stationary and occasionally moveable which is just like scapula bone and the bal and socket joint of human shoulder and hence they work comparatively and effectively to work good

AI examiner evaluation

Task Achievement / Task Response: Band 4.5

You identify several relevant parts of the arm, including the computer, motors, elbow, wrist, gripper, pivot, shoulder and base, and you attempt to compare these with human anatomy. However, the response does not clearly summarise how the diagram is organised or give a concise overview of the machine’s functions. Some comparisons are unsupported or inaccurate: the elbow is compared with the tibia and fibula, and the base is equated with the scapula and shoulder joint, although these relationships are not shown in the diagram. The alternative end-effectors—spraying paint, drilling and welding—are omitted. To develop the response, select the main features shown and describe their functions accurately, distinguishing diagram information from additional anatomical comparisons.

Coherence and Cohesion: Band 3.5

The response follows a rough path from the computer and motors down through the arm to the base, so a reader can identify some of the parts being discussed. However, nearly all the information is compressed into one long sequence, with little punctuation or clear separation between ideas. Repeated use of “and” makes the relationships between components difficult to follow, while phrases such as “and hence they work comparatively and effectively” do not clearly connect to the preceding details. Organise the report into a brief overview and a paragraph describing the components and their functions. Use full stops and linking expressions selectively, and make references such as “it” or “they” clearly identify the part being discussed.

Lexical Resource: Band 5.5

You use some task-relevant vocabulary, including “precision,” “flexibility,” “pivot,” “stationary” and “moveable,” and you attempt to describe the functions of several components. This gives you a useful starting range for the topic. However, some wording is imprecise or repetitive, such as “work good” and “working comparatively and effectively,” and several component descriptions are difficult to interpret because words are missing or misspelled, including “buillt in sensors contro force.” More precise terms such as “controls,” “rotates” and “end-effector” would help explain the diagram clearly. Check spelling and choose natural collocations; for example, describe the base as “usually stationary but occasionally movable,” rather than repeating the idea in less controlled wording.

Grammatical Range and Accuracy: Band 4.5

You attempt to combine several ideas in longer sentences, but control of sentence structure is limited, and errors frequently make the relationships between ideas unclear. For example, “a computer controls precision of motors that are attached to gripper” lacks necessary articles and does not clearly express how the motors connect to the components. There are also agreement and verb-form problems in “there is a shoulder that move” and “occasionally moveable,” as well as inconsistent capitalisation and punctuation. Practise writing complete sentences with one main idea each, checking subject–verb agreement and articles—for instance, “The shoulder raises and lowers the arm.” Then add accurate linking clauses once the basic sentence is clear.

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