Band 4.5 IELTS Writing Task 1 Model Answer

Overall Band Score: 4.5 · IELTS Momentum Workout · 2026-10-19

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)

this diagram shows the structure of a rabotic arm and explain the function of its different parts as well as showing some alternative tolls that can be attached to it

overall the rabortic arm consist of base pivot shoulder wrist elbow and gripper and the there are 3 motors that are attached through the computer with rabotic arm the computer precision the control of motors the base is usually stationary movables shoulder helps to raise or below the arm the gripper is built in sensor control force wrist allow gripper to flexible elbow allows movment

AI examiner evaluation

Task Achievement / Task Response: Band 5.0

You identify the diagram as a robotic arm and mention several relevant components, including the base, pivot, shoulder, wrist, elbow, gripper, and three motors. You also report some functions, such as the shoulder raising or lowering the arm and the gripper sensors controlling force. However, the response only partially covers the task: it does not explain how the computer connects to and controls the motors clearly, omits the pivot’s rotation function, and does not describe the alternative end-effectors or their uses. The overview is limited, and several details are unclear or inaccurate. The response is also 55 words below the required minimum, leaving too little space to summarise the main features adequately. Develop a fuller account of the arm’s layout and the alternative tools.

Coherence and Cohesion: Band 4.0

The response has a basic overall direction: it introduces the diagram and then lists components and functions. This gives the reader some sense of the subject, but the information is compressed into two lines, with no clear paragraphing or progression from the control system to the arm’s structure and then its attachments. The long second sentence strings together several points without effective punctuation or linking, as in “the base is usually stationary movables shoulder helps to raise or below the arm.” This makes relationships between details difficult to follow. Organise the response into an introduction, an overview, and a logically ordered description, using clear sentence boundaries and links such as “at the base” and “at the end of the arm.”

Lexical Resource: Band 5.0

You use some relevant task vocabulary, including “motors,” “base,” “pivot,” “shoulder,” “wrist,” “elbow,” and “gripper,” and you attempt to describe functions. However, the range is limited, and spelling and word-choice errors are noticeable: “rabotic” and “rabortic” for “robotic,” “tolls” for “tools,” and “movables” where “movable” is intended. Phrases such as “the computer precision the control of motors” and “wrist allow gripper to flexible” are not expressed with natural collocations, which can make the meaning hard to interpret. Build a more precise set of verbs for describing functions, such as “controls,” “rotates,” “raises,” and “attaches,” and check spelling and word forms carefully.

Grammatical Range and Accuracy: Band 4.5

The response attempts to combine information about components and their functions, but it relies mainly on simple clauses and does not show a controlled range of sentence structures. Frequent errors in agreement, verb forms, articles, and sentence boundaries make several statements difficult to understand. For example, “the rabortic arm consist” needs a singular verb, while “shoulder helps to raise or below the arm” has an unclear verb pattern. In “wrist allow gripper to flexible,” the subject–verb agreement and infinitive construction are both faulty. Punctuation is also missing between many ideas. Use complete sentences with a clear subject and verb, and check agreement and infinitive forms—for example, “The wrist allows the gripper to flex or rotate.”

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