Band 4.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.5 · IELTS Momentum Workout · 2026-11-13

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)

introduction.

in this diagram illustrate that how the mechanical arm works, and how the joints of arm function working like human arms. this process include many process.

overall, in this diagram that show the step of mechanical armworking. first step is computer presion control of motors. the three motor attached to computer. each motor has different function. one is attached to the shoulder lower arm. and it function is moving the lower arm. and this diagram show more than 6 steps.

BODY PARAGRAPH 1:

first step is computer presion control the motor. and three motor are in this process. each has different function. one is attached to the lower arm and second is attached to the ellbow of arm to make it easy for movement and flexbility. and the third one is attached to gripper to easily control, the force of any thing and weight.

body paragraph 2

the remaining step is compare this to drill holes. and welding machine. and a spray paint. all machine has different step for manufacturing.

AI examiner evaluation

Task Achievement / Task Response: Band 4.5

You identify the diagram as showing a computer-controlled mechanical arm and mention the three motors and gripper, so the response is connected to the task. However, the account is only partial and several details are inaccurate or unclear. For example, you say a motor is “attached to the shoulder lower arm” and describe it as moving the lower arm, whereas the diagram labels the shoulder as raising and lowering the arm. The pivot, wrist, and the gripper’s ability to flex or rotate are omitted. The final paragraph also treats the spray gun, drill, and welding examples as manufacturing steps, rather than alternative end-effectors. A clearer overview of the arm’s main parts and their functions, followed by accurate comparisons, would make the summary more complete and relevant.

Coherence and Cohesion: Band 4.0

The response has an introduction, an overview-like paragraph, and two body sections, which gives it a basic attempt at organisation. However, the information does not progress clearly: the computer and motors are repeated in both the overview and Body Paragraph 1, while the final paragraph shifts abruptly to the alternative tools without explaining their relationship to the arm. Phrases such as “first step” also suggest a sequence, although the diagram presents components and functions rather than a series of manufacturing stages. Connections between ideas are limited, and references such as “this process” and “the remaining step” are not always clear. Organise the description from the base and joints along the arm to the gripper, then explain the alternative end-effectors in a separate, clearly linked section.

Lexical Resource: Band 5.0

You use some relevant task vocabulary, including “motor,” “shoulder,” “gripper,” “force,” and “flexibility,” which helps identify the subject. However, the range is limited and several phrases are repetitive or imprecise, such as “different function,” “this process,” and “all machine has different step.” Some spelling errors, including “presion,” “ellbow,” and “flexbility,” also reduce clarity. In places, the chosen wording changes the meaning: “compare this to drill holes” does not clearly express that drilling is an alternative use of an end-effector. Build a more precise set of terms for describing components and functions, and check spelling. For example, use “alternative applications” for the tool examples and “controls the gripping force” for the sensor function.

Grammatical Range and Accuracy: Band 4.5

The response relies mainly on short, simple statements and shows limited control of sentence structure. Errors occur frequently, and some make relationships between parts difficult to understand. For instance, “in this diagram illustrate that how the mechanical arm works” lacks a clear subject and uses an incorrect clause structure; “the three motor attached to computer” is missing a verb and has a singular/plural mismatch. There are also problems with articles and sentence formation in “one is attached to the shoulder lower arm,” while “all machine has” has incorrect agreement. Try forming complete sentences with a clear subject and verb, and use accurate plural forms. A few controlled complex sentences using “which” or “while” could help explain how each joint functions without sacrificing clarity.

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