Band 4+: The diagram shows the consumption of renewable energy in the USA from 1949-2008. Write a 150-word report for a university lecturer identifying the main trends and making comparisons where relevant.

The report addresses the task and provides an overview, but it contains several inaccuracies and omissions. The initial total consumption is incorrectly stated as 3 quadrillion in 1950, whereas the visual description indicates it was 2 quadrillion in 1949. The description of hydroelectric power and wood is somewhat vague and not entirely accurate; for instance, wood is said to decline slightly, but the report states it decreased to about 2 quadrillion, which is not consistent with the given data. Additionally, the report introduces wind energy, which is not mentioned in the visual description, and the figures for biofuels and wind are not supported. To improve, ensure that all data points are accurately reported and avoid introducing information not present in the visual. Focus on clearly summarizing the main trends and key features without unnecessary details. The report falls short of the required 150 words.

The report has a clear overall structure with an introduction and an overview, but the body paragraphs lack clear organization and logical progression. The data is presented in a somewhat confusing manner, with overlapping time periods and unclear comparisons. The use of cohesive devices is limited and sometimes inaccurate (e.g., 'in contrast' is used incorrectly). To improve, organize the information by source or time period, use clear topic sentences, and ensure that each paragraph focuses on a distinct aspect of the data. Also, use a range of linking words and referencing to improve flow.

The vocabulary is adequate but limited, with some repetition (e.g., 'consumption' used frequently) and imprecise word choices (e.g., 'fluctuation' is used but not clearly demonstrated). There is an attempt to use a range of expressions, but some are inaccurate or awkward (e.g., 'dipped to approximately 0.2 quadrillion' is unclear). To improve, use a wider range of synonyms and more precise terms (e.g., 'rose steadily', 'peaked at', 'declined gradually'). Also, ensure that the language is natural and appropriate for the context.

The report contains several grammatical errors and awkward phrasing that affect clarity. For example, 'The graph provide' should be 'The graph provides', and 'showed fluctuation' should be 'showed fluctuations'. There are also issues with subject-verb agreement and tense consistency. The range of sentence structures is limited, with many simple sentences. To improve, focus on grammar accuracy, especially subject-verb agreement and verb tenses. Also, try to use a variety of complex structures, such as subordinate clauses and passive voice, to demonstrate greater grammatical control.